     //----------------------------------
 
     /**
-     *  @copy mx.layout.LayoutBase#horizontalScrollPositionDelta
-     */
-    public function verticalScrollPositionDelta(unit:uint):Number
+     *  @copy mx.layout.LayoutBase#getVerticalScrollPositionDelta
+     */
+    public function getVerticalScrollPositionDelta(unit:ScrollUnit):Number
     {
         // TBD: replace provisional implementation
         var scrollR:Rectangle = scrollRect;

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

    /**
     *  @copy mx.layout.LayoutBase#horizontalScrollPositionDelta
     */
    public function horizontalScrollPositionDelta(unit:uint):Number
    {
        // TBD: replace provisional implementation
        var scrollR:Rectangle = scrollRect;


import mx.core.IViewport;
import mx.core.UIComponent;
import mx.core.ScrollUnit;
import mx.events.FlexEvent;
import mx.events.TextOperationEvent;
import mx.utils.TextUtil;
