[flexcoders] Advanced datagrid dataprovider error

[hworke]

Hi in my main application I have a advanceddatagrid
and the code is:

  <mx:AdvancedDataGrid id="advnGrid" width="100%" height="100%">        
        <mx:dataProvider>
            <mx:HierarchicalData id="advDataGrid" source="{one}/>
        </mx:dataProvider>
        <mx:columns>
            <mx:AdvancedDataGridColumn dataField="Region"/>
        </mx:columns>
   </mx:AdvancedDataGrid>

now with an event in an external component I tried to set a new
dataprvider like this:

mx.core.Application.application.controlPanel.advDataGrid.source = tree;
mx.core.Application.application.controlPanel.cntrlGrid.dataProvider =
mx.core.Application.application.controlPanel.advDataGrid;

mx.core.Application.application.controlPanel.cntrlGrid.validateNow();


But it does not change the advanced datagrid content. Where am I make
the mistake?

Regards....