Version 1.5
-------------
* Bug
 * combobox: The 'onSelect' event does not fire when load data that contains the selected item. fixed.
 * datagrid: The 'updateRow' method sometimes does not work properly when the field is set to a blank value. fixed.
* Improvement
 * A label can be associated to any form fields.
 * combobox: Enhance the 'select' and 'unselect' rules on the drop-down items.
 * combobox: Add 'limitToList' property to limit the inputed values to the listed items.
 * combogrid: Allow the user to clone the component quickly.
 * form: Add the 'dirty' property that allows the user to submit the only changed fields.
 * form: Add 'resetDirty' method.
 * datagrid: Allow the user to display a message when there are no records to be shown.
 * textbox: Add 'label','labelWidth','labelPosition' and 'labelAlign' properties.
 * spinner: Add 'spinAlign' property.
 * calendar: Allow the user to display week number of the year.
 * window: Add 'constrain' property.
* New Plugins
 * passwordbox: The plugin that allows the user to input passwords with nice feedback.
 * combotreegrid: Combines combobox with drop-down treegrid component.

Version 1.4.5
-------------
* Bug
 * datagrid: The 'getChanges' method does not return the updated rows after calling 'updateRow' method. fixed.
 * treegrid: The 'onLoadSuccess' event fires when append or insert a row. fixed.
 * tree: The 'onLoadSuccess' event fires when append or insert a node. fixed.
* Improvement
 * window: The displaying style can be customized.
 * window: The 'border' property allows the user to set different border style.
 * navpanel: The 'href' property is enabled to load content from remote server.
 * combotree: The 'setValue' and 'setValues' methods accept the paremter values in 'id' and 'text' pairs
 * combobox: Add 'showItemIcon' property.
 * combobox: Set 'groupPosition' property to 'sticky' to stick the item group to the top of drop-down panel.
 * messager: Pressing ENTER key on input box will trigger click event of the first button.
 * validatebox: Add 'editable',disabled' and 'readonly' properties.
 * validatebox: Add 'enable','disable','readonly' methods.
 * validatebox: Allow the user to determine how to display the error message.
 * filebox: Add 'accept' and 'multiple' properties.
 * form: Add 'iframe' property and 'onProgress' event.
 * treegrid: Add cascade checkbox selection.
 * treegrid: Add 'getCheckedNodes','checkNode' and 'uncheckNode' methods.

Version 1.4.4
-------------
* Bug
 * filebox: The 'clear' and 'reset' methods do not work properly in IE9. fixed.
 * messager: After calling $.messager.progress() with no arguments, the $.messager.progress('close') does not work properly. fixed.
 * timespinner: The value does not display properly in IE8 while clicking the spin buttons. fixed.
 * window: The window does not display when calling 'options' method in 'onMove' event. fixed.
 * treegrid: The 'getLevel' method does not accept the parameter value of 0. fixed.
* Improvement
 * layout: The 'collapsedContent','expandMode' and 'hideExpandTool' properties are supported in region panel.
 * layout: The 'hideCollapsedContent' property can be set to display the vertical title bar on collapsed panel.
 * layout: Add 'onCollapse','onExpand','onAdd','onRemove' events.
 * datagrid: Display the 'up-down' icon on the sortable columns.
 * datagrid: Add 'gotoPage' method.
 * propertygrid: Add 'groups' method that allows to get all the data groups.
 * messager: Auto scroll feature is supported when displaying long messages.
 * tabs: The 'disabled' property is supported when defining a disabled tab panel.
 * tabs: The percentange size is supported now.

Version 1.4.3
-------------
* Bug
 * textbox: The 'setText' method does not accept value 0. fixed.
 * timespinner: When running in IE11, the error occurs when clicking on the empty textbox. fixed.
 * tabs: The 'update' method can not update only the panel body. fixed.
* Improvement
 * combobox: Improve the performance of displaying the drop-down panel.
 * combogrid: Remember the displaying text when the drop-down datagrid go to other pages.
 * combogrid: The 'setValue' and 'setValues' methods accept a key-value object.
 * window: The inline window's mask can auto-stretch its size to fill parent container.
 * tabs: The 'showTool' and 'hideTool' methods are available for users to show or hide the tools.
 * layout: Allow the user to override the 'cls','headerCls' and 'bodyCls' property values.
* New Plugins
 * switchbutton: The switch button with two states:'on' and 'off'.

Version 1.4.2
-------------
* Bug
 * treegrid: The column will restore its size to original size after recreating the treegrid. fixed.
* Improvement
 * draggable: Add 'delay' property that allows the user to delay the drag operation.
 * tree: Add 'filter' property and 'doFilter' method.
 * tabs: The 'add' method allows the user to insert a tab panel at a specified index.
 * tabs: The user can determine what tab panel can be selected.
 * tabs: Add 'justified' and 'narrow' properties.
 * layout: Add 'unsplit' and 'split' methods.
 * messager: Keyboard navigation features are supported now.
 * form: Add 'onChange' event.
 * combobox: Add 'queryParams' property.
 * slider: Add 'range' property.
 * menu: Add 'itemHeight','inline','noline' properties.
 * panel: The 'header' property allows the user to customize the panel header.
 * menubutton: Add 'hasDownArrow' property.
* New Plugins
 * datalist: The plugin to render items in a list.
 * navpanel: The root component for the mobile page.
 * mobile: The plugin to provide the mobile page stack management and navigation.

Version 1.4.1
-------------
* Bug
 * combogrid: The combogrid has different height than other combo components. fixed.
 * datagrid: The row element loses some class style value after calling 'updateRow' method. fixed.
 * menubutton: Calling 'enable' method on a disabled button can not work well. fixed.
 * form: The filebox components in the form do not work correctly after calling 'clear' method. fixed.
* Improvement
 * tabs: The 'update' method accepts 'type' option that allows the user to update the header,body,or both.
 * panel: Add 'openAnimation','openDuration','closeAnimation' and 'closeDuration' properties to set the animation for opening or closing a panel.
 * panel: Add 'footer' property that allows the user to add a footer bar to the bottom of panel.
 * datagrid: Calling 'endEdit' method will accept the editing value correctly.
 * datagrid: Add 'onBeforeSelect','onBeforeCheck','onBeforeUnselect','onBeforeUncheck' events.
 * propertygrid: The user can edit a row by calling 'beginEdit' method.
 * datebox: Add 'cloneFrom' method to create the datebox component quickly.
 * datetimebox: Add 'cloneFrom' method to create the datetimebox component quickly.

Version 1.4
-------------
* Bug
 * menu: The menu should not has a correct height when removed a menu item. fixed.
 * datagrid: The 'fitColumns' method does not work normally when the datarid width is too small. fixed.
* Improvement
 * The fluid/percentange size is supported now for all easyui components.
 * menu: Add 'showItem', 'hideItem' and 'resize' methods.
 * menu: Auto resize the height upon the window size.
 * menu: Add 'duration' property that allows the user to define duration time in milliseconds to hide menu.
 * validatebox: Add 'onBeforeValidate' and 'onValidate' events.
 * combo: Extended from textbox now.
 * combo: Add 'panelMinWidth','panelMaxWidth','panelMinHeight' and 'panelMaxHeight' properties.
 * searchbox: Extended from textbox now.
 * tree: The 'getRoot' method will return the top parent node of a specified node if pass a 'nodeEl' parameter.
 * tree: Add 'queryParams' property.
 * datetimebox: Add 'spinnerWidth' property.
 * panel: Add 'doLayout' method to cause the panel to lay out its components.
 * panel: Add 'clear' method to clear the panel's content.
 * datagrid: The user is allowed to assign percent width to columns.
 * form: Add 'ajax','novalidate' and 'queryParams' properties.
 * linkbutton: Add 'resize' method.
* New Plugins
 * textbox: A enhanced input field that allows users build their form easily.
 * datetimespinner: A date and time spinner that allows to pick a specific day.
 * filebox: The filebox component represents a file field of the forms.

Version 1.3.6
-------------
* Bug
 * treegrid: The 'getChecked' method can not return correct checked rows. fixed.
 * tree: The checkbox does not display properly on async tree when 'onlyLeafCheck' property is true. fixed.
* Improvement
 * treegrid: All the selecting and checking methods are extended from datagrid component.
 * linkbutton: The icon alignment is fully supported, possible values are: 'top','bottom','left','right'.
 * linkbutton: Add 'size' property, possible values are: 'small','large'.
 * linkbutton: Add 'onClick' event.
 * menubutton: Add 'menuAlign' property that allows the user set top level menu alignment.
 * combo: Add 'panelAlign' property, possible values are: 'left','right'.
 * calendar: The 'formatter','styler' and 'validator' options are available to custom the calendar dates.
 * calendar: Add 'onChange' event.
 * panel: Add 'method','queryParams' and 'loader' options.
 * panel: Add 'onLoadError' event.
 * datagrid: Add 'onBeginEdit' event that fires when a row goes into edit mode.
 * datagrid: Add 'onEndEdit' event that fires when finishing editing but before destroying editors.
 * datagrid: Add 'sort' method and 'onBeforeSortColumn' event.
 * datagrid: The 'combogrid' editor has been integrated into datagrid.
 * datagrid: Add 'ctrlSelect' property that only allows multi-selection when ctrl+click is used.
 * slider: Add 'converter' option that allows users determine how to convert a value to the slider position or the slider position to the value.
 * searchbox: Add 'disabled' property.
 * searchbox: Add 'disable','enable','clear','reset' methods.
 * spinner: Add 'readonly' property, 'readonly' method and 'onChange' event.

Version 1.3.5
-------------
* Bug
 * searchbox: The 'searcher' function can not offer 'name' parameter value correctly. fixed.
 * combo: The 'isValid' method can not return boolean value. fixed.
 * combo: Clicking combo will trigger the 'onHidePanel' event of other combo components that have hidden drop-down panels. fixed.
 * combogrid: Some methods can not inherit from combo. fixed.
* Improvement
 * datagrid: Improve performance on checking rows.
 * menu: Allows to append a menu separator.
 * menu: Add 'hideOnUnhover' property to indicate if the menu should be hidden when mouse exits it.
 * slider: Add 'clear' and 'reset' methods.
 * tabs: Add 'unselect' method that will trigger 'onUnselect' event.
 * tabs: Add 'selected' property to specify what tab panel will be opened.
 * tabs: The 'collapsible' property of tab panel is supported to determine if the tab panel can be collapsed.
 * tabs: Add 'showHeader' property, 'showHeader' and 'hideHeader' methods.
 * combobox: The 'disabled' property can be used to disable some items.
 * tree: Improve loading performance.
 * pagination: The 'layout' property can be used to customize the pagination layout.
 * accordion: Add 'unselect' method that will trigger 'onUnselect' event.
 * accordion: Add 'selected' and 'multiple' properties.
 * accordion: Add 'getSelections' method.
 * datebox: Add 'sharedCalendar' property that allows multiple datebox components share one calendar component.

Version 1.3.4
-------------
* Bug
 * combobox: The onLoadSuccess event fires when parsing empty local data. fixed.
 * form: Calling 'reset' method can not reset datebox field. fixed.
* Improvement
 * mobile: The context menu and double click features are supported on mobile devices.
 * combobox: The 'groupField' and 'groupFormatter' options are available to display items in groups.
 * tree: When append or insert nodes, the 'data' parameter accepts one or more nodes data.
 * tree: The 'getChecked' method accepts a single 'state' or an array of 'state'.
 * tree: Add 'scrollTo' method.
 * datagrid: The 'multiSort' property is added to support multiple column sorting.
 * datagrid: The 'rowStyler' and column 'styler' can return CSS class name or inline styles.
 * treegrid: Add 'load' method to load data and navigate to the first page.
 * tabs: Add 'tabWidth' and 'tabHeight' properties.
 * validatebox: The 'novalidate' property is available to indicate whether to perform the validation.
 * validatebox: Add 'enableValidation' and 'disableValidation' methods.
 * form: Add 'enableValidation' and 'disableValidation' methods.
 * slider: Add 'onComplete' event.
 * pagination: The 'buttons' property accepts the existing element.

Version 1.3.3
-------------
* Bug
 * datagrid: Some style features are not supported by column styler function. fixed.
 * datagrid: IE 31 stylesheet limit. fixed.
 * treegrid: Some style features are not supported by column styler function. fixed.
 * menu: The auto width of menu item displays incorrect in ie6. fixed.
 * combo: The 'onHidePanel' event can not fire when clicked outside the combo area. fixed. 
* Improvement
 * datagrid: Add 'scrollTo' and 'highlightRow' methods.
 * treegrid: Enable treegrid to parse data from <tbody> element.
 * combo: Add 'selectOnNavigation' and 'readonly' options.
 * combobox: Add 'loadFilter' option to allow users to change data format before loading into combobox.
 * tree: Add 'onBeforeDrop' callback event.
 * validatebox: Dependent on tooltip plugin now, add 'deltaX' property.
 * numberbox: The 'filter' options can be used to determine if the key pressed was accepted.
 * linkbutton: The group button is available.
 * layout: The 'minWidth','maxWidth','minHeight','maxHeight' and 'collapsible' properties are available for region panel.
* New Plugins
 * tooltip: Display a popup message when moving mouse over an element.
 
Version 1.3.2
-------------
* Bug
 * datagrid: The loading message window can not be centered when changing the width of datagrid. fixed.
 * treegrid: The 'mergeCells' method can not work normally. fixed.
 * propertygrid: Calling 'endEdit' method to stop editing a row will cause errors. fixed.
 * tree: Can not load empty data when 'lines' property set to true. fixed.
* Improvement
 * RTL feature is supported now.
 * tabs: Add 'scrollBy' method to scroll the tab header by the specified amount of pixels
 * tabs: Add 'toolPosition' property to set tab tools to left or right.
 * tabs: Add 'tabPosition' property to define the tab position, possible values are: 'top','bottom','left','right'.
 * datagrid: Add a column level property 'order' that allows users to define different default sort order per column.
 * datagrid: Add a column level property 'halign' that allows users to define how to align the column header.
 * datagrid: Add 'resizeHandle' property to define the resizing column position, by grabbing the left or right edge of the column.
 * datagrid: Add 'freezeRow' method to freeze some rows that will always be displayed at the top when the datagrid is scrolled down.
 * datagrid: Add 'clearChecked' method to clear all checked records.
 * datagrid: Add 'data' property to initialize the datagrid data.
 * linkbutton: Add 'iconAlgin' property to define the icon position, supported values are: 'left','right'.
 * menu: Add 'minWidth' property.
 * menu: The menu width can be automatically calculated.
 * tree: New events are available including 'onBeforeDrag','onStartDrag','onDragEnter','onDragOver','onDragLeave',etc.
 * combo: Add 'height' property to allow users to define the height of combo.
 * combo: Add 'reset' method.
 * numberbox: Add 'reset' method.
 * spinner: Add 'reset' method.
 * spinner: Add 'height' property to allow users to define the height of spinner.
 * searchbox: Add 'height' property to allow users to define the height of searchbox.
 * form: Add 'reset' method.
 * validatebox: Add 'delay' property to delay validating from the last inputting value.
 * validatebox: Add 'tipPosition' property to define the tip position, supported values are: 'left','right'.
 * validatebox: Multiple validate rules on a field is supported now.
 * slider: Add 'reversed' property to determine if the min value and max value will switch their positions.
 * progressbar: Add 'height' property to allow users to define the height of progressbar.

Version 1.3.1
-------------
* Bug
 * datagrid: Setting the 'pageNumber' property is not valid. fixed.
 * datagrid: The id attribute of rows isn't adjusted properly while calling 'insertRow' or 'deleteRow' method.
 * dialog: When load content from 'href', the script will run twice. fixed.
 * propertygrid: The editors that extended from combo can not accept its changed value. fixed.
* Improvement
 * droppable: Add 'disabled' property.
 * droppable: Add 'options','enable' and 'disable' methods.
 * tabs: The tab panel tools can be changed by calling 'update' method.
 * messager: When show a message window, the user can define the window position by applying 'style' property.
 * window: Prevent script on window body from running twice.
 * window: Add 'hcenter','vcenter' and 'center' methods.
 * tree: Add 'onBeforeCheck' callback event.
 * tree: Extend the 'getChecked' method to allow users to get 'checked','unchecked' or 'indeterminate' nodes.
 * treegrid: Add 'update' method to update a specified node.
 * treegrid: Add 'insert' method to insert a new node.
 * treegrid: Add 'pop' method to remove a node and get the removed node data.

Version 1.3
-----------
* Bug
 * combogrid: When set to 'remote' query mode, the 'queryParams' parameters can't be sent to server. fixed.
 * combotree: The tree nodes on drop-down panel can not be unchecked while calling 'clear' method. fixed.
 * datetimebox: Setting 'showSeconds' property to false cannot hide seconds info. fixed.
 * datagrid: Calling 'mergeCells' method can't auto resize the merged cell while header is hidden. fixed.
 * dialog: Set cache to false and load data via ajax, the content cannot be refreshed. fixed.
* Improvement
 * The HTML5 'data-options' attribute is available for components to declare all custom options, including properties and events.
 * More detailed documentation is available.
 * panel: Prevent script on panel body from running twice.
 * accordion: Add 'getPanelIndex' method.
 * accordion: The tools can be added on panel header.
 * datetimebox: Add 'timeSeparator' option that allows users to define the time separator.
 * pagination: Add 'refresh' and 'select' methods.
 * datagrid: Auto resize the column width to fit the contents when the column width is not defined.
 * datagrid: Double click on the right border of columns to auto resize the columns to the contents in the columns.
 * datagrid: Add 'autoSizeColumn' method that allows users to adjust the column width to fit the contents.
 * datagrid: Add 'getChecked' method to get all rows where the checkbox has been checked.
 * datagrid: Add 'selectOnCheck' and 'checkOnSelect' properties and some checking methods to enhance the row selections.
 * datagrid: Add 'pagePosition' property to allow users to display pager bar at either top,bottom or both places of the grid.
 * datagrid: The buffer view and virtual scroll view are supported to display large amounts of records without pagination.
 * tabs: Add 'disableTab' and 'enableTab' methods to allow users to disable or enable a tab panel.

Version 1.2.6
-------------
* Bug
 * tabs: Call 'add' method with 'selected:false' option, the added tab panel is always selected. fixed.
 * treegrid: The 'onSelect' and 'onUnselect' events can't be triggered. fixed.
 * treegrid: Cannot display zero value field. fixed. 
* Improvement
 * propertygrid: Add 'expandGroup' and 'collapseGroup' methods.
 * layout: Allow users to create collapsed layout panels by assigning 'collapsed' property to true.
 * layout: Add 'add' and 'remove' methods that allow users to dynamically add or remove region panel.
 * layout: Additional tool icons can be added on region panel header.
 * calendar: Add 'firstDay' option that allow users to set first day of week. Sunday is 0, Monday is 1, ...
 * tree: Add 'lines' option, true to display tree lines. 
 * tree: Add 'loadFilter' option that allow users to change data format before loading into the tree.
 * tree: Add 'loader' option that allow users to define how to load data from remote server.
 * treegrid: Add 'onClickCell' and 'onDblClickCell' callback function options.
 * datagrid: Add 'autoRowHeight' property that allow users to determine if set the row height based on the contents of that row.
 * datagrid: Improve performance to load large data set.
 * datagrid: Add 'loader' option that allow users to define how to load data from remote server.
 * treegrid: Add 'loader' option that allow users to define how to load data from remote server.
 * combobox: Add 'onBeforeLoad' callback event function.
 * combobox: Add 'loader' option that allow users to define how to load data from remote server.
 * Add support for other loading mode such as dwr,xml,etc.
* New Plugins
 * slider: Allows the user to choose a numeric value from a finite range.

Version 1.2.5
-------------
* Bug
 * tabs: When add a new tab panel with href property, the content page is loaded twice. fixed.
 * form: Failed to call 'load' method to load form input with complex name. fixed.
 * draggable: End drag in ie9, the cursor cannot be restored. fixed.
* Improvement
 * panel: The tools can be defined via html markup.
 * tabs: Call 'close' method to close specified tab panel, users can pass tab title or index of tab panel. Other methods such 'select','getTab' and 'exists' are similar to 'close' method.
 * tabs: Add 'getTabIndex' method.
 * tabs: Users can define mini tools on tabs.
 * tree: The mouse must move a specified distance to begin drag and drop operation.
 * resizable: Add 'options','enable' and 'disable' methods.
 * numberbox: Allow users to change number format.
 * datagrid: The subgrid is supported now.
 * searchbox: Add 'selectName' method to select searching type name.

Version 1.2.4
-------------
* Bug
 * menu: The menu position is wrong when scroll bar appears. fixed.
 * accordion: Cannot display the default selected panel in jQuery 1.6.2. fixed.
 * tabs: Cannot display the default selected tab panel in jQuery 1.6.2. fixed.
* Improvement
 * menu: Allow users to disable or enable menu item.
 * combo: Add 'delay' property to set the delay time to do searching from the last key input event.
 * treegrid: The 'getEditors' and 'getEditor' methods are supported now.
 * treegrid: The 'loadFilter' option is supported now.
 * messager: Add 'progress' method to display a message box with a progress bar.
 * panel: Add 'extractor' option to allow users to extract panel content from ajax response.
* New Plugins
 * searchbox: Allow users to type words into box and do searching operation.
 * progressbar: To display the progress of a task.
 
Version 1.2.3
-------------
* Bug
 * window: Cannot resize the window with iframe content. fixed.
 * tree: The node will be removed when dragging to its child. fixed.
 * combogrid: The onChange event fires multiple times. fixed.
 * accordion: Cannot add batch new panels when animate property is set to true. fixed.
* Improvement
 * treegrid: The footer row and row styler features are supported now.
 * treegrid: Add 'getLevel','reloadFooter','getFooterRows' methods.
 * treegrid: Support root nodes pagination and editable features.
 * datagrid: Add 'getFooterRows','reloadFooter','insertRow' methods and improve editing performance.
 * datagrid: Add 'loadFilter' option that allow users to change original source data to standard data format.
 * draggable: Add 'onBeforeDrag' callback event function.
 * validatebox: Add 'remote' validation type.
 * combobox: Add 'method' option.
* New Plugins
 * propertygrid: Allow users to edit property value in datagrid. 

Version 1.2.2
-------------
* Bug
 * datagrid: Apply fitColumns cannot work fine while set checkbox column. fixed.
 * datagrid: The validateRow method cannot return boolean type value. fixed.
 * numberbox: Cannot fix value in chrome when min or max property isn't defined. fixed.
* Improvement
 * menu: Add some crud methods.
 * combo: Add hasDownArrow property to determine whether to display the down arrow button.
 * tree: Supports inline editing.
 * calendar: Add some useful methods such as 'resize', 'moveTo' etc.
 * timespinner: Add some useful methods.
 * datebox: Refactoring based on combo and calendar plugin now.
 * datagrid: Allow users to change row style in some conditions.
 * datagrid: Users can use the footer row to display summary information.
* New Plugins
 * datetimebox: Combines datebox with timespinner component.
  
Version 1.2.1
-------------
* Bug
 * easyloader: Some dependencies cannot be loaded by their order. fixed.
 * tree: The checkbox is setted incorrectly when removing a node. fixed.
 * dialog: The dialog layout incorrectly when 'closed' property is setted to true. fixed.
* Improvement
 * parser: Add onComplete callback function that can indicate whether the parse action is complete.
 * menu: Add onClick callback function and some other methods.
 * tree: Add some useful methods.
 * tree: Drag and Drop feature is supported now.
 * tree: Add onContextMenu callback function.
 * tabs: Add onContextMenu callback function.
 * tabs: Add 'tools' property that can create buttons on right bar.
 * datagrid: Add onHeaderContextMenu and onRowContextMenu callback functions.
 * datagrid: Custom view is supported.
 * treegrid: Add onContextMenu callback function and append,remove methods.
  
Version 1.2
-------------
* Improvement
 * tree: Add cascadeCheck,onlyLeafCheck properties and select event.
 * combobox: Enable multiple selection.
 * combotree: Enable multiple selection.
 * tabs: Remember the trace of selection, when current tab panel is closed, the previous selected tab will be selected.
 * datagrid: Extend from panel, so many properties defined in panel can be used for datagrid.
* New Plugins
 * treegrid: Represent tabular data in hierarchical view, combines tree view and datagrid.
 * combo: The basic component that allow user to extend their combo component such as combobox,combotree,etc.
 * combogrid: Combines combobox with drop-down datagrid component.
 * spinner: The basic plugin to create numberspinner,timespinner,etc.
 * numberspinner: The numberbox that allow user to change value by clicking up and down spin buttons.
 * timespinner: The time selector that allow user to quickly inc/dec a time.
 
Version 1.1.2
-------------
* Bug
 * messager: When call show method in layout, the message window will be blocked. fixed.
* Improvement
 * datagrid: Add validateRow method, remember the current editing row status when do editing action.
 * datagrid: Add the ability to create merged cells.
 * form: Add callback functions when loading data.
 * panel,window,dialog: Add maximize,minimize,restore,collapse,expand methods.
 * panel,tabs,accordion: The lazy loading feature is supported.
 * tabs: Add getSelected,update,getTab methods.
 * accordion: Add crud methods.
 * linkbutton: Accept an id option to set the id attribute.
 * tree: Enhance tree node operation.
 
Version 1.1.1
-------------
* Bug
 * form: Cannot clear the value of combobox and combotree component. fixed.
* Improvement
 * tree: Add some useful methods such as 'getRoot','getChildren','update',etc.
 * datagrid: Add editable feature, improve performance while loading data.
 * datebox: Add destroy method.
 * combobox: Add destroy and clear method.
 * combotree: Add destroy and clear method.
 
Version 1.1
-------------
* Bug
 * messager: When call show method with timeout property setted, an error occurs while clicking the close button. fixed.
 * combobox: The editable property of combobox plugin is invalid. fixed.
 * window: The proxy box will not be removed when dragging or resizing exceed browser border in ie. fixed.
* Improvement
 * menu: The menu item can use <a> markup to display a different page.
 * tree: The tree node can use <a> markup to act as a tree menu.
 * pagination: Add some event on refresh button and page list.
 * datagrid: Add a 'param' parameter for reload method, with which users can pass query parameter when reload data.
 * numberbox: Add required validation support, the usage is same as validatebox plugin.
 * combobox: Add required validation support.
 * combotree: Add required validation support.
 * layout: Add some method that can get a region panel and attach event handlers.
* New Plugins
 * droppable: A droppable plugin that supports drag drop operation.
 * calendar: A calendar plugin that can either be embedded within a page or popup.
 * datebox: Combines a textbox with a calendar that let users to select date.
 * easyloader: A JavaScript loader that allows you to load plugin and their dependencies into your page.
 
Version 1.0.5
* Bug
 * panel: The fit property of panel performs incorrectly. fixed.
* Improvement
 * menu: Add a href attribute for menu item, with which user can display a different page in the current browser window.
 * form: Add a validate method to do validation for validatebox component.
 * dialog: The dialog can read collapsible,minimizable,maximizable and resizable attribute from markup.
* New Plugins
 * validatebox: A validation plugin that checks to make sure the user's input value is valid. 
 
Version 1.0.4
-------------
* Bug
 * panel: When panel is invisible, it is abnormal when resized. fixed.
 * panel: Memory leak in method 'destroy'. fixed.
 * messager: Memory leak when messager box is closed. fixed.
 * dialog: No onLoad event occurs when loading remote data. fixed.
* Improvement
 * panel: Add method 'setTitle'.
 * window: Add method 'setTitle'.
 * dialog: Add method 'setTitle'.
 * combotree: Add method 'getValue'.
 * combobox: Add method 'getValue'.
 * form: The 'load' method can load data and fill combobox and combotree field correctly.
 
Version 1.0.3
-------------
* Bug
 * menu: When menu is show in a DIV container, it will be cropped. fixed.
 * layout: If you collpase a region panel and then expand it immediately, the region panel will not show normally. fixed.
 * accordion: If no panel selected then the first one will become selected and the first panel's body height will not set correctly. fixed.
* Improvement
 * tree: Add some methods to support CRUD operation.
 * datagrid: Toolbar can accept a new property named 'disabled' to disable the specified tool button.
* New Plugins
 * combobox: Combines a textbox with a list of options that users are able to choose from.
 * combotree: Combines combobox with drop-down tree component.
 * numberbox: Make input element can only enter number char.
 * dialog: rewrite the dialog plugin, dialog can contains toolbar and buttons.
