  *  Skin class for the popUpDown state (when arrowButton is in down 
  *  state) of the background and border.
  *  @default mx.skins.halo.PopUpButtonSkin
+ *  
+ *  @langversion 3.0
+ *  @playerversion Flash 9
+ *  @playerversion AIR 1.1
+ *  @productversion Flex 3
  */
 [Style(name="popUpDownSkin", type="Class", inherit="no")]
 

    
    /**
     *  Opens the UIComponent object specified by the <code>popUp</code> property.
     */  
    public function open():void
    {

 *  Number of vertical pixels between the PopUpButton and the
 *  specified popup UIComponent.
 *  The default value is 0.
 *  
 *  @langversion 3.0
 *  @playerversion Flash 9
 *  @playerversion AIR 1.1
 *  @productversion Flex 3
 */
[Style(name="popUpGap", type="Number", format="Length", inherit="no")]

