 import flash.geom.Rectangle;
 import flash.events.Event;
 import flash.events.EventDispatcher;
-import flash.ui.Keyboard;
 
 import mx.components.baseClasses.GroupBase;
 import mx.core.ScrollUnit;

     * 
     *  If <code>requestedRowCount</code> is -1, then all of the items are displayed.
     * 
     *  This value implies the layout's <code>measuredHeight</code>.
     * 
     *  If the height of the <code>target</code> has been explicitly set,
     *  this property has no effect.
     * 
     *  @default -1
     */

    }
    
    /**
     *  Sets the <code>rowCount</code> property and dispatches a
     *  PropertyChangeEvent.
     * 
     *  This method is intended to be used by subclass updateDisplayList() 
     *  methods to sync the rowCount property with the actual number
