The grouping property is the default MXML property of the GroupingCollection class
<?xml version="1.0"?>
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<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
import mx.collections.ArrayCollection;
[Bindable]
private var dpFlat:ArrayCollection = new ArrayCollection([
{Column1:"Southwest", Territory:"Arizona",Column2:"Barbara Jennings", Value1:38865, Value2:40000},
{Column1:"Southwest", Territory:"Arizona",Column2:"Dana Binn", Value1:29885, Value2:30000},
{Column1:"Southwest", Territory:"Central California",Column2:"Joe Smith", Value1:29134, Value2:30000},
{Column1:"Southwest", Territory:"Nevada",Column2:"Bethany Pittman", Value1:52888, Value2:45000},
{Column1:"Southwest", Territory:"Northern California",Column2:"Lauren Ipsum", Value1:38805, Value2:40000},
{Column1:"Southwest", Territory:"Northern California",Column2:"T.R. Smith", Value1:55498, Value2:40000},
{Column1:"Southwest", Territory:"Southern California",Column2:"Alice Treu", Value1:44985, Value2:45000},
{Column1:"Southwest", Territory:"Southern California",Column2:"Jane Grove", Value1:44913, Value2:45000}
]);
</mx:Script>
<mx:AdvancedDataGrid id="myADG" width="100%" height="100%" initialize="gc.refresh();">
<mx:dataProvider>
<mx:GroupingCollection2 id="gc" source="{dpFlat}">
<mx:Grouping>
<mx:GroupingField name="Column1" />
<mx:GroupingField name="Territory" />
</mx:Grouping>
</mx:GroupingCollection2>
</mx:dataProvider>
<mx:columns>
<mx:AdvancedDataGridColumn dataField="Column1" />
<mx:AdvancedDataGridColumn dataField="Territory" />
<mx:AdvancedDataGridColumn dataField="Column2" headerText="Territory Rep" />
<mx:AdvancedDataGridColumn dataField="Value1" />
<mx:AdvancedDataGridColumn dataField="Value2" />
</mx:columns>
</mx:AdvancedDataGrid>
</mx:Application>
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