     public function GridLayout()
     {
         super();
+        gridDimensions = new GridDimensions();
     }
 
     //--------------------------------------------------------------------------

        
        // To avoid flashing, force all of the layers to render now
        
        backgroundLayer.validateNow();
        selectionLayer.validateNow();
        overlayLayer.validateNow();
        
        // The old visible row,column indices are no longer needed
        

import mx.events.CollectionEventKind;
import mx.events.PropertyChangeEvent;

import spark.components.DataGrid;
import spark.components.Grid;
import spark.layouts.supportClasses.LayoutBase;

