Why the first AdvancedDataGridColumn in AdvancedDataGrid can not be disabled?

Question

Hi,
I defined a AdvancedDataGrid control, and defined 2 column, the first the AdvancedDataGirdColumn display a name and second AdvancedDataGirdColumn display a checkbox, where the itemList is an array of item whose enable property is the itemRenderer's enable state.
But I found out that the enable state was not applied to first column.
If I add a dummy AdvancedDataGirdColumn, so the name becomes second column, then the enable state shows.
Anyone has the solution? Thanks.
Here is my code:
//nameRenderer.mxml defines a mx:Label to display name
<mx:Label id="name" height="18" enabled="{_data.enabled}" text="{_data.name}"/>
//checkboxRenderer.mxml defines a checkbox to select
<mx:CheckBox id="check" width="18" height="18" click="setInUse()" selected="{_data.selected}" enabled="{_data.enabled}"/>
//main mxml
var itemList:ArrayCollection = new ArrayCollection();
// adding item to itemList, where the item has a member - enabled
// AdvancedDataGrid component, here the enable state does not apply to name_col
<mx:AdvancedDataGrid id="mydatagrid" iconFunction="{null}" folderClosedIcon="{null}" folderOpenIcon="{null}"  >
    <mx:dataProvider>
         <mx:HierarchicalData source="{this.itemList}"/>
    </mx:dataProvider>
    <mx:columns>
          <mx:AdvancedDataGridColumn id="name_col" dataField="name" editable="false" itemRenderer="views.renderers.nameRenderer" draggable="false"/>
          <mx:AdvancedDataGridColumn id="checkBox_col" dataField="selected" editable = "false" itemRenderer="views.renderers.checkboxRenderer" width="18" headerText=""/>
    </mx:columns>
</mx:AdvancedDataGrid>
// AdvancedDataGrid component with the first column as dummy, here the enable state applies to name_col
<mx:AdvancedDataGrid id="mydatagrid" iconFunction="{null}" folderClosedIcon="{null}" folderOpenIcon="{null}"  >
    <mx:dataProvider>
         <mx:HierarchicalData source="{this.itemList}"/>
    </mx:dataProvider>
    <mx:columns>
          <mx:AdvancedDataGridColumn id="dummy_col" width="20"/>
          <mx:AdvancedDataGridColumn id="name_col" dataField="name" editable="false" itemRenderer="views.renderers.nameRenderer" draggable="false"/>
          <mx:AdvancedDataGridColumn id="checkBox_col" dataField="selected" editable = "false" itemRenderer="views.renderers.checkboxRenderer" width="18" headerText=""/>
    </mx:columns>
</mx:AdvancedDataGrid>

Answer 1

I'm not certain what the message meant, but it's posible that you still had an application open.