flex AdvancedDataGrid自定义列的问题
在AdvancedDataGrid控件中，使用itemRenderer在一列中加入linkbutton等控件，但是又一个问题，就是在AdvancedDataGrid第一列（树形）分组的行上也会有linkbutton，如何能让分组那行没有linkbutton呢
<mx:AdvancedDataGrid id="myVM" width="100%" height="100%" textAlign="center"
defaultLeafIcon="{null}" folderOpenIcon="{null}" folderClosedIcon="{null}" displayItemsExpanded="true"
doubleClickEnabled="true" itemDoubleClick="myVM_itemDoubleClickHandler(event)">
<mx:dataProvider>
<mx:GroupingCollection id="vm" source="{arraylist}">
<mx:Grouping>
<mx:GroupingField name="room_name"/>
<mx:GroupingField name="team_name"/>
</mx:Grouping>
</mx:GroupingCollection>
</mx:dataProvider>
<mx:columns>
<mx:AdvancedDataGridColumn headerText="虚拟机主机名" textAlign="left" dataField="vm_name"/>
<mx:AdvancedDataGridColumn headerText="虚拟机IP地址" dataField="vm_ip" width="100"/>
<mx:AdvancedDataGridColumn headerText="虚拟机域账号" textAlign="left" dataField="domain_account" width="100"/>
<mx:AdvancedDataGridColumn headerText="虚拟机CPU数" dataField="vm_cpu_num" width="80"/>
<mx:AdvancedDataGridColumn headerText="虚拟机内存" dataField="vm_mem" width="100"/>
<mx:AdvancedDataGridColumn headerText="虚拟机主频" dataField="vm_hz" width="80"/>
<mx:AdvancedDataGridColumn headerText="虚拟机硬盘数" dataField="vm_disk_num" width="80"/>
<mx:AdvancedDataGridColumn textAlign="center" headerText="修改" width="80">
<mx:itemRenderer>
<mx:Component>
<mx:LinkButton useHandCursor="true" buttonMode="true"
click="outerDocument.upp_vm_list_clickHandler(this)"
icon="@Embed(source='assets/styles/default/images/icons/application_form_edit.png')"/>
</mx:Component>
</mx:itemRenderer>
</mx:AdvancedDataGridColumn>
<mx:AdvancedDataGridColumn textAlign="center" headerText="删除" width="80">
<mx:itemRenderer>
<mx:Component>
<mx:LinkButton useHandCursor="true" buttonMode="true"
click="outerDocument.del_vm_list_clickHandler(this)"
icon="@Embed(source='assets/styles/default/images/icons/cancel.png')"/>
</mx:Component>
</mx:itemRenderer>
</mx:AdvancedDataGridColumn>
</mx:columns>
</mx:AdvancedDataGrid>
