         }
     }
 }
-
-import spark.layouts.supportClasses.LayoutBase;
-
-class NullLayout extends LayoutBase
-{
-    public function NullLayout()
-    {
-        super();
-    }
-}
    import spark.components.supportClasses.CellPosition;
    import spark.components.supportClasses.GridColumn;
    import spark.components.supportClasses.GridDimensions;
    import spark.components.supportClasses.GridLayout;
    import spark.components.supportClasses.GridSelection;
    import spark.components.supportClasses.GridSelectionMode;

            super();
            layout = new GridLayout();
            
            backgroundGroup = new GridLayer();
            addElement(backgroundGroup);
            
            selectionGroup = new GridLayer();
            addElement(selectionGroup);
            
            itemRendererGroup = this;
            
            overlayGroup = new GridLayer();
            addElement(overlayGroup);        
            
            MouseEventUtil.addDownDragUpListeners(this, 
