[flexcoders] Combobox in Datagrid appears empty

[emarionjacobs]

I have a simple Combobox defined as the itemEditor for a DataGrid as shown 
below.  The ArrayCollection that is its DataProvider is populated from 
creationComplete of the parent Canvas - and I can see the data going in via the 
debugger.  However, when I insert a row into the datagrid under the 
circumstances that make the column editable and actually click on that column, 
I only see an empty row popping up under the combobox, never any data.  Can 
anyone shed any light on what's missing here?

<mx:DataGridColumn 
  dataField="Genre"
  editable="{chartTrackListGrid.selectedItem.TrackCode == null}">
  <mx:itemEditor>
    <mx:Component>
      <mx:ComboBox 
        dataProvider="{parentDocument.model.genreList}"
        labelField="Name" />
    </mx:Component>
  </mx:itemEditor>
</mx:DataGridColumn>