Flex4.0 Sprite 删除Child后如何处理空白

[xh_214]

目前我正在修改一个Flex4.0做的项目，在主页的底部有七个按钮，现在要屏蔽或者删除其中几个，我在as文件中用程序成功删除了中间的4个按钮，但是却留下了空白，如何删除这些空白，让最后一个按钮能靠左显示，请大神们指点一下。就剩38分了。

ab = new AllButtons();
bts = ab.getChildByName("bts") as Sprite;
var removeBt3:SimpleButton = bts.getChildByName("bt3") as SimpleButton;
var removeBt4:SimpleButton = bts.getChildByName("bt4") as SimpleButton;
var removeBt5:SimpleButton = bts.getChildByName("bt5") as SimpleButton;
var removeBt7:SimpleButton = bts.getChildByName("bt7") as SimpleButton;
			
bts.removeChild(removeBt3);
bts.removeChild(removeBt4);
bts.removeChild(removeBt5);
bts.removeChild(removeBt7);