DataGrid学习1

　　任务1：程序实现对dataGrid的某列进行排序操作。
　　让DataGrid发送一个HeaderRelease事件，就可以实现  // 用于点击按钮实现对datagrid的重新排序 protected function btnSort_clickHandler(event:MouseEvent):void { var dge:DataGridEvent = new DataGridEvent(DataGridEvent.HEADER_RELEASE, false, true, 0, null, 0, null, null, 0); dgTest1.dispatchEvent(dge); } 。。。  任务2：DataGrid中加入CheckBox，某列为DropDownList，并且在点击时才显示ddl。
　　其中一个问题是，需要点击时，直接下拉DropDownList，搞了好几天，最后找到方法为openDropDown。  flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" focusEnabled="true" creationComplete="mxdatagriditemrenderer1_creation CompleteHandler(event)">    width="100%" selectedIndex="{data.State=='Delete'? 0 : 1}" change="ddl_changeHandler(event)">      ---------------------------------------  flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" creationComplete="application1_creationCompleteHan dler(event)">                                    width="236" height="198" click="taInfo_clickHandler(event)"/>