     {
         super.partAdded(partName, instance);
  
-         if (instance == muteButton)
+        if (instance == muteButton)
         {
             if (dropDownController)
                 dropDownController.openButton = muteButton;

[Event(name="open", type="spark.events.DropDownEvent")]

/**
 *  Dispatched when the user presses the mute button control.
 *
 *  @eventType flash.events.MouseEvent
 *  
 *  @langversion 3.0
 *  @playerversion Flash 10
 *  @playerversion AIR 1.5
 *  @productversion Flex 4
 */
[Event(name="muteButtonClick", type="flash.events.MouseEvent")]

/**
 *  Open State of the DropDown component

        
            if (instance == dropDown)
                dropDownController.dropDown = null;
        }
         
        super.partRemoved(partName, instance);
    }
    
    /**
     *  @private
     *  On focus, pop open the drop down and validate everything so 
     *  we can draw focus on one of the drop-down parts (the thumb)
     */
    override public function setFocus():void
    {
        openDropDown();
        LayoutManager.getInstance().validateNow();
        super.setFocus();
    }
    
    /**
