在hdividedbox中一次移动多个分隔符

我正在尝试在图表下面有一个可拖动的视区的小地图显示。我基本上用它来控制图表的视区:

<mx:annotationElements>
 <mx:HDividedBox id="dividedBox" horizontalScrollPolicy="off" width="100%" height="100%" liveDragging="true" borderSides="bottom top">
     <mx:Canvas id="leftBox" backgroundColor="#FFFFFF" backgroundAlpha="0.5" width="50%" height="100%" borderColor="#333333" borderThickness="1" borderStyle="solid" borderSides="top right bottom" />
     <mx:Canvas id="centerBox" backgroundColor="#FFFFFF" backgroundAlpha="0" width="50%" height="100%" buttonMode="true" minWidth="100" mouseDown="rangeWindowMouseHandler(event);" mouseUp="rangeWindowMouseHandler(event);" mouseMove="rangeWindowMouseHandler(event);" />
     <mx:Canvas id="rightBox" backgroundColor="#FFFFFF" backgroundAlpha="0.5" width="0%" height="100%" borderColor="#333333" borderThickness="1" borderStyle="solid" borderSides="top left bottom" />
  </mx:HDividedBox>
</mx:annotationElements>

使用以下脚本:

private function rangeWindowMouseHandler(event:MouseEvent):void { 
    if(event.target === centerBox) {  
     var coords:Object = rangeDragCoordinates; 

     switch(event.type.toLowerCase()) {
      case 'mousedown':
       rangeDrag = true;
       break;
      case 'mouseup':
       rangeDrag = false;       
       break;
      case 'mousemove':           
       if(rangeDrag) {        
        var xDiff:Number = -(coords.x - event.stageX) * 4.0;

        for(var i:Number = 0; i < dividedBox.numDividers; i++) {         
         dividedBox.moveDivider(i, xDiff);
        }  

       }
       break;
     }

     coords.x = event.stageX;
     coords.y = event.stageY;
    }
   } 

问题是,实际上一次只有一个除法器移动。我发现,如果我在移动下一个分隔符之前设置了大约50毫秒的超时,两个分隔符都会移动。然而,这似乎是一个相当笨拙的方法来处理这一问题,并且容易出错。

有人知道是否可以同时移动hdividebox中的两个分隔符,或者我应该采取另一种方法吗?