      *  for programatic selection updates, for example when writing a keyboard
      *  or mouse event handler. </p> 
      *  
-     *  @default undefined
+     *  @default null
      * 
      *  @return Vector of <code>dataProvider</code> items.
      *  

    [Bindable("valueCommit")]
    
    /**
     *  If <code>selectionMode</code> is <code>GridSelectionMode.SINGLE_ROW</code>
     *  or <code>GridSelectionMode.MULTIPLE_ROWS</code>, returns the
     *  number of selected rows, and if <code>selectionMode</code> is 
     *  <code>GridSelectionMode.SINGLE_CELLS</code>
     *  or <code>GridSelectionMode.MULTIPLE_CELLS</code>, returns the
     *  number of selected cells.
     * 
     *  @default 0
     * 
     *  @return Number of selected rows or cells.
     *    
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 2.0

    //--------------------------------------------------------------------------
    
    /**
     *  @copy spark.components.gridClasses.GridSelection#selectAll()
     *    
     *  @see spark.components.Grid#clearSelection
     *  @see spark.components.Grid#selectIndices
