void setScrollTrack(CCScale9Sprite *st){
		if(_scrollTrack){ _scrollTrack->removeAllChildrenWithCleanup(true);}
		_scrollTrack = st;
		if(st){
			addChild(st, 254);
		}
	}
	void setScrollBar(CCScale9Sprite *s){
		if(_scrollBar){ _scrollBar->removeAllChildrenWithCleanup(true);}
		_scrollBar = s;
		if(s){
			addChild(s, 255);
		}
	}