 		
 		// Don't drag-scroll in the horizontal direction
 		dragScrollRegionSizeHorizontal = 0;
+        
+        // Virtualization defaults for cases
+        // where there are no items and no typical item.
+        // The llv defaults are the width/height of a Spark Button skin.
+        llv.defaultMinorSize = 71;
+        llv.defaultMajorSize = 22;
     }   
     
     //--------------------------------------------------------------------------

    {
        if (_requestedRowCount == value)
            return;
                               
        _requestedRowCount = value;
        invalidateTargetSizeAndDisplayList();
    }    

    //----------------------------------

        if (!layoutTarget)
            return;
            
        if (useVirtualLayout)
            measureVirtual(layoutTarget);
        else 
            measureReal(layoutTarget);
