     /**
      *  @private
      */
-    public function set dataTipField(value:IFactory):void
+    public function set dataTipField(value:String):void
     {
         if (setGridProperty("dataTipField", value))
             dispatchChangeEvent("dataTipFieldChanged");

        typicalItem: null,
        variableRowHeight: true,
        dataTipField: null,
        dataTipFunction:null
    };
    
    /** 

     *  @playerversion AIR 1.5
     *  @productversion Flex 4.5
     */
    public function get dataTipField():String
    {
        return getGridProperty("dataTipField");
    }
