                                       relatedObject:DisplayObject = null,
                                       oldIndex:Number = -1,
                                       newIndex:Number = -1,
-                                      triggerEvent:Event = null, 
-                                      multipleSelectionChange:Boolean = false)
+                                      triggerEvent:Event = null)
     {
         super(type, bubbles, cancelable);
 

     *     <tr><td><code>Type</code></td><td>IndexChangedEvent.HEADER_SHIFT</td></tr>
     *  </table>
     *   
      *  @eventType selectionChanging
     *  
     *  @langversion 3.0
     *  @playerversion Flash 9
     *  @playerversion AIR 1.1
     *  @productversion Flex 3
     */
    public static const SELECTION_CHANGING:String = "selectionChanging";
    
    /**
     *  The IndexChangedEvent.ITEM_FOCUS_CHANGED constant defines the value of the 
     *  <code>type</code> property of the event object for a <code>itemFocusChanging</code> event,
     *  which indicates that the current item in focus is about to change. 
     *
     *  <p>The properties of the event object have the following values:</p>

    public static const HEADER_SHIFT:String = "headerShift";
    
    /**
     *  The IndexChangedEvent.CHANGING constant defines the value of the 
     *  <code>type</code> property of the event object for a <code>changing</code> event,
     *  which indicates that the current selection is about to change. 
     *
     *  <p>The properties of the event object have the following values:</p>
