[flexcoders] How to create summary in GroupingCollection -- AS3

[vkc_nair]

Hi All, 

I have a function to create the grouping (two levels), which is the 
data provider for Advanceddatagrid. I want to add summary at the 
group 
node. How to do that? 
eg 
     Node1(20) 
         Node1.1(5) 
         Node1.2(15) 
    Node2(10) 
          Node2.1(8) 
           Node2.2(2) 


This is my function. 


public function resultGroupByLane():void{ 


               var mygroup:GroupingCollection=new 
GroupingCollection(); 
                mygroup.source = model.gatetransaction; 


                var group:Grouping = new Grouping(); 
                var gf:GroupingField = new GroupingField("laneid"); 
                var gf1:GroupingField = new GroupingField("wtaskid"); 


                group.fields=[gf,gf1]; 


                mygroup.grouping = group; 


                mygroup.refresh(); 
                dggroup.dataProvider = mygroup; 
       } 


Thanks