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<?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%" defaultLeafIcon="{null}">
        <mx:dataProvider>
            <mx:HierarchicalData source="{myHierarchicalData}" />
        </mx:dataProvider>
        <mx:columns>
            <mx:AdvancedDataGridColumn dataField="Column1" />
            <mx:AdvancedDataGridColumn dataField="Column2" headerText="Column 2" />
            <mx:AdvancedDataGridColumn dataField="Value1" />
            <mx:AdvancedDataGridColumn dataField="Value2" />
        </mx:columns>
    </mx:AdvancedDataGrid>
</mx:Application>

1.	AdvancedDataGridColumn for the GroupLabel field
2.	Add multiple groups to the control
3.	AdvancedDataGridColumn inside Columns
4.	Custom icons for the folder open and closed icons
5.	Use groupedColumns component to group columns together
6.	Create the column grouping
7.	Multiple column sort when the sortExpertMode property is set to true
8.	Add groups named Area and Revenues
9.	Column Grouping for Hierarchical Data
10.	Regroup GroupCollection

Set default leaf icon to null to hide it : AdvancedDataGridColumn « Grid « Flex

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