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Use HierarchicalData as data Provider

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:Script>                  import mx.collections.ArrayCollection;         private var myHierarchicalData:ArrayCollection = new ArrayCollection([             {Column1:"A", children: [                           {Column1:"B", children: [                                         {Column2:"C", Value1:3, Value2:4},                                         {Column2:"D", Value1:2, Value2:3}]},                           {Column1:"E", children: [                                         {Column2:"F", Value1:2, Value2:3}]},                                         {Column1:"G", children: [                                                       {Column2:"H", Value1:5, Value2:4}]},                                         {Column1:"I", children: [{Column2:"J", Value1:3, Value2:4},                                         {Column2:"K", Value1:5, Value2:4}]},                                         {Column1:"L", children: [                                                       {Column2:"M", Value1:4, Value2:4},                                                       {Column2:"N", Value1:4, Value2:4}]}                            ]}         ]);            </mx:Script>     <mx:AdvancedDataGrid width="100%" height="100%">         <mx:dataProvider>             <mx:HierarchicalData source="{myHierarchicalData}" />         </mx:dataProvider>         <mx:columns>             <mx:AdvancedDataGridColumn dataField="Column1" />             <mx:AdvancedDataGridColumn dataField="Column2" headerText="Column 2 Rep" />             <mx:AdvancedDataGridColumn dataField="Value1" />             <mx:AdvancedDataGridColumn dataField="Value2" />         </mx:columns>     </mx:AdvancedDataGrid> </mx:Application>