[flexcoders] InteractiveObject Problem

[lehaianh1986]

I have an event for my right click mouse on AdvancedDataGrid. I want to collect 
row item data so my code is

public function menuItemSelect(evt:ContextMenuEvent):void
{
  var searchString:String;
  var inObj:InteractiveObject;
  inObj = evt.mouseTarget;
  if (inObj.hasOwnProperty("data"))
  {
    var obj:Object = inObj.data;
    if (obj.hasOwnProperty("Index"))
        searchString = obj.Index;
    else
        searchString = "";
  }
  else
    searchString = "";
...
}

The error is "Access of possibly undefined property data through a reference 
with static type 
 flash.display:InteractiveObject" in line

var obj:Object = inObj.data;

but I see in debug mode

inObj = inObj = 
(mx.controls.advancedDataGridClasses.AdvancedDataGridItemRenderer) 
mx.controls.advancedDataGridClasses.AdvancedDataGridItemRenderer (@9385479)  

inObj.data = inObj.data = (Object) Object (@699b629)    
        Index = "1" : String    
        mx_internal_uid = "AC2A10E1-8A14-7CDD-FF42-A40DE4F2CDA2" : String       
        ....

So why the code false? How to solve it?