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);
}
}