[flexcoders] Grouping in Advanced Data Grid

[v.ponvino]

Hi,
  I am using one java method returning ArrayList which contains Map objects.
java method:

  public List fun3()
     {
        
                 List ar = new ArrayList<Map>();
                 
       
                Map m=new HashMap();         
                m.put("Operation","New Account");
                m.put("Status","Opened");
                m.put("Count","50");
                m.put("Urgent","true");
                ar.add(m);
            
                Map m1=new HashMap();         
                m1.put("Operation","New Account");
                m1.put("Status","InProgress");
                m1.put("Count","25");
                m1.put("Urgent","false");
                ar.add(m1);
                
                Map m2=new HashMap();         
                m2.put("Operation","AccountUpdates");
                m2.put("Status","Updates");
                m2.put("Count","100");
                m2.put("Urgent","false");
                ar.add(m2); 
              
                 return ar;
         
     }

then i create remote object and call this method in flex it is also returning 
data.

But i want to group the data by operation field .I tried the following code but 
it doesn't work.

<mx:AdvancedDataGrid id="myADG" 
        width="25%" height="100%" 
        initialize="gc.refresh();" showHeaders="false" itemClick="getnode()">   
     
        <mx:dataProvider>
            <mx:GroupingCollection id="gc" source="{Arr}">
                <mx:grouping>
                    <mx:Grouping >
                        <mx:GroupingField name="Operation"/>
                         
                    </mx:Grouping>
                </mx:grouping>
            </mx:GroupingCollection>
        </mx:dataProvider>        
        
        <mx:columns>
           
                
        
            <mx:AdvancedDataGridColumn dataField="Status" width="200"/>
            <mx:AdvancedDataGridColumn dataField="Count"/>
            <mx:AdvancedDataGridColumn dataField="Urgent" width="25" 
itemRenderer="rend"/>
            
        </mx:columns>
   </mx:AdvancedDataGrid>
        
If anybody knows the solution please reply


Regards,
Pon