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Creating groups in ActionScript

<?xml version="1.0"?> <!-- dpcontrols/adg/SimpleGroupADG.mxml --> <!-- Code from Flex 4 Documentation "Using Adobe Flex 4". This user guide is licensed for use under the terms of the Creative Commons Attribution  Non-Commercial 3.0 License.  This License allows users to copy, distribute, and transmit the user guide for noncommercial  purposes only so long as    (1) proper attribution to Adobe is given as the owner of the user guide; and    (2) any reuse or distribution of the user guide contains a notice that use of the user guide is governed by these terms.  The best way to provide notice is to include the following link.  To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/ --> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:Script>                  import mx.collections.GroupingField;         import mx.collections.Grouping;         import mx.collections.GroupingCollection2;         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}         ]);          [Bindable]         public var myGColl:GroupingCollection2 = new GroupingCollection2();         private var myGrp:Grouping = new Grouping();         private function initDG():void {             myGColl.source = dpFlat;             myGrp.fields = [new GroupingField("Column1"), new GroupingField("Territory")];             myGColl.grouping = myGrp;             myADG.dataProvider=myGColl;             myGColl.refresh();         }            </mx:Script>     <mx:AdvancedDataGrid id="myADG" width="100%"         height="100%" creationComplete="initDG();">         <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>