怎么在datagrid中添加一列combobox

代码：
<s:DataGrid x="252" y="103" width="1046" height="244" fontStyle="italic"
fontWeight="bold" requestedRowCount="4" textAlign="center">
<s:columns>
<s:ArrayList>
<s:GridColumn width="70" dataField="dataField1" headerText="选择"
resizable="true">
<s:itemRenderer>
<fx:Component>
<mx:CheckBox label="{data.dataField1}"
selected="{data.resizable}"
paddingLeft="10"
click="data.resizable = !data.resizable"/>
</fx:Component>
</s:itemRenderer>
</s:GridColumn>
<s:GridColumn dataField="dataField4" headerText="管理员帐号"></s:GridColumn>
<s:GridColumn dataField="dataField6" headerText="管理员密码"></s:GridColumn>
<s:GridColumn width="80" dataField="dataField1" headerText="状态"></s:GridColumn>
<s:GridColumn width="220" dataField="dataField7" headerText="操作"></s:GridColumn>
</s:ArrayList>
</s:columns>