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Using GroupingCollection2 component

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:Script>                  import mx.collections.ArrayCollection;         [Bindable]         public var myAC:ArrayCollection = new ArrayCollection([             {category:'Friends', name:'A', email:'j@domain.com'},             {category:'Friends', name:'B', email:'f@domain.com'},             {category:'Friends', name:'C', email:'r@domain.com'},             {category:'Family',  name:'D', email:'z@domain.com'},             {category:'Family',  name:'E', email:'s@domain.com'}]);            </mx:Script>     <mx:GroupingCollection2 id="myGC" source="{myAC}">         <mx:Grouping>             <mx:GroupingField name="category" />         </mx:Grouping>     </mx:GroupingCollection2>     <mx:AdvancedDataGrid dataProvider="{myGC}" initialize="myGC.refresh()" width="300">         <mx:columns>             <mx:AdvancedDataGridColumn dataField="name"  headerText="Contacts" />             <mx:AdvancedDataGridColumn dataField="email" headerText="Email" />         </mx:columns>     </mx:AdvancedDataGrid> </mx:Application>