     private var _selectionLength:int = 0;    
     
     /**
-     *  If the selectionMode is either <code>GridSelectionMode.SINGLE_ROW</code> or
-     *  <code>GridSelectionMode.MULTIPLE_ROWS</code>, returns the number of
-     *  selected rows and if the selectionMode is either 
+     *  If the <code>selectionMode</code> is either 
+     *  <code>GridSelectionMode.SINGLE_ROW</code> or
+     *  <code>GridSelectionMode.MULTIPLE_ROWS</code>, contains the number of
+     *  selected rows.
+     *  If the <code>selectionMode</code> is either 
      *  <code>GridSelectionMode.SINGLE_CELL</code> or
-     *  <code>GridSelectionMode.MULTIPLE_CELLS</code>, returns the number of
-     *  selected cells.  If selectionMode is <code>GridSelectionMode.NONE</code>
-     *  returns 0.
-     * 
-     *  @return Number of selected rows or cells depending on selectionMode.
-     *
+     *  <code>GridSelectionMode.MULTIPLE_CELLS</code>, contains the number of
+     *  selected cells.  
+     *  If the <code>selectionMode</code> is <code>GridSelectionMode.NONE</code>, 
+     *  contains 0.
+     * 
      *  @default 0
      * 
      *  @langversion 3.0
      *  @playerversion Flash 10
-     *  @playerversion AIR 2.0
+     *  @playerversion AIR 2.5
      *  @productversion Flex 4.5
      */
     public function get selectionLength():int

     * 
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 2.0
     *  @productversion Flex 4.5
     */
    public function get requireSelection():Boolean

    //-------------------------------------------------------------------------- 
    
    /**
     *  @private
     *  Called when the grid's columns dispatches a 
     *  <code>CollectionEvent.COLLECTION_CHANGE</code> event.  It handles
     *  each of the events defined in <code>CollectionEventKind</code>.
     *
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 2.5
     *  @productversion Flex 4.5
     */
    public function columnsCollectionChanged(event:CollectionEvent):void
