             return;
 
         updateScrollRect(g.width, g.height);
-        // TBD: subclasses override to update first,lastIndexInView 
     }
     
     /**

     *  is larger than its width,height, or the target's 
     *  vertical,horizontalScrollPosition is non-zero.
     * 
     *  If none of the above conditions are true, the scrollRect
     *  is set to null.
     * 
     *  @param w The target's unscaled width.
     *  @param h The target's unscaled height.
     * 
     *  @see target
     *  @see updateDisplayList
     *  @see flex.core.GroupBase#contentWidth
     *  @see flex.core.GroupBase#contentHeight

import flash.ui.Keyboard;

import flex.core.GroupBase;
import flex.intf.ILayoutItem;
import flash.events.EventDispatcher;

    
public class LayoutBase extends EventDispatcher
{
    //--------------------------------------------------------------------------
    //
