AdvancedDataGrid itemrenderer gripes

Question

After a year of begging, I finally got my company to upgrade my FlexBuilder to the Professional edition for the Data Visualization goodies in there. So i've been playing around with the advancedDataGrid: is it me or does it seem a little half-baked? Don't want to go off topic before I get to my topic so I won't go into it now, but it hasn't been a smooth ride so far.
Case in point, itemRenderers. I have a flat xml file displaying data as hierarchical using grouping, and applying a stylefunction to the tree with mixed results. For the top-level text item in the tree I want to add a link, so I thought, no problem, I'll add an itemrenderer with a linkbutton. When I apply it I lose everything in that column.  Here's my adg:
<mx:AdvancedDataGrid id="myADG" styleFunction="myRowStyleFunction"
        width="100%" height="100%" sortExpertMode="true"
        initialize="gc.refresh();"
        styleName="enhancedChargesGrid"
        verticalGridLineColor="#ffffff"  headerHeight="20">
        <mx:dataProvider>
            <mx:GroupingCollection id="gc" source="{adgChargesList}" childrenField="undefined">
                <mx:grouping>
                    <mx:Grouping>
                        <mx:GroupingField name="ServiceType" descending="true" id="st">
                            <mx:summaries>
                              <mx:SummaryRow summaryPlacement="group">
                                <mx:fields>
                                    <mx:SummaryField dataField="Charges"
                                        label="Charges" operation="SUM"/>
                                    <mx:SummaryField dataField="Accounts"
                                        label="Accounts" operation="SUM"/>
                                </mx:fields>
                              </mx:SummaryRow>
                            </mx:summaries>
                        </mx:GroupingField>
                        <mx:GroupingField name="Charge" descending="true" >
                            <mx:summaries>
                              <mx:SummaryRow summaryPlacement="group">
                                <mx:fields>
                                    <mx:SummaryField dataField="Charges"
                                        label="Charges" operation="SUM"/>
                                       <mx:SummaryField dataField="Accounts"
                                        label="Accounts" operation="SUM"/>
                                </mx:fields>
                              </mx:SummaryRow>
                            </mx:summaries>
                        </mx:GroupingField>
                    </mx:Grouping>
                </mx:grouping>
            </mx:GroupingCollection>
        </mx:dataProvider> 
        <mx:columns>
            <mx:AdvancedDataGridColumn id="cgeCol" dataField="ChargeType" styleFunction="myColStyleFunc"
                headerText="" width="200" fontWeight="normal"/>
            <mx:AdvancedDataGridColumn dataField="Accounts" headerText="Accounts" textAlign="right" fontWeight="bold"/>
            <mx:AdvancedDataGridColumn dataField="Usage" headerText="Usage" textAlign="right"/>
            <mx:AdvancedDataGridColumn dataField="Units" headerText="Units" textAlign="left"/>
            <mx:AdvancedDataGridColumn dataField="UnitCharges" headerText="Unit Charges"/>
            <mx:AdvancedDataGridColumn dataField="Charges" id="cges" headerText="Charges" fontWeight="bold" textAlign="right" formatter="{ccyFormatter}"/>
        </mx:columns>
          <mx:rendererProviders>
             <mx:AdvancedDataGridRendererProvider
                column="{cgeCol}"
                depth="1"
                columnSpan="1"
                renderer="renderers.adgRenderer"/>
          </mx:rendererProviders>
    </mx:AdvancedDataGrid>
My simple renderer:
<mx:LinkButton xmlns:mx="http://www.adobe.com/2006/mxml"
     label="{data.ServiceType}" fontWeight="bold" fontSize="14"/>
And a sample of my XML:
<charges>
  <item>
    <ServiceType>Total Subscriber Charges</ServiceType>
    <Charge>Usage Charges</Charge>
    <ChargeType>Voice - Cellular</ChargeType>
    <Accounts>9</Accounts>
    <Usage>55184</Usage>
    <Units>mins</Units>
    <UnitCharges>0.072</UnitCharges>
    <Charges>3950.08</Charges>
  </item>
</charges>
This worked well in the regular datagrid. I suspect it has something to do  with the groupings but nothing I've goggled for has uncovered anything like that. Any help would be appreciated.
Jack

Answer 1

Hi,
I think inside your itemrenderer you can override the updateDisplayList method and make "lblExercitii" label's includeInLayout and visible property values to false if the data.id_exercitii is null. If data.id_exercitii is not null make "lblExercitii" label's includeInLayout and visible property values to true.