RemoveChild();

galera, to fazendo uma espécie de tooltip e quero que com no MOUSEOUT o label e tudo mais sejam apagados, to tentando usar o removechild, ja li varios topicos a respeito mas não funciona, me ajudem plz!!

MC.mcleg1.addEventListener(MouseEvent.ROLL_OVER, Tooltip);
 MC.mcleg1.addEventListener(MouseEvent.ROLL_OUT, OutTooltip);
 var ybut:Number = MC.mcleg1.y
 var xbut:Number = MC.mcleg1.x
 trace (ybut);
 trace (xbut);

 function Tooltip (event:MouseEvent):void {

 background = new Shape();
 background.graphics.beginFill(0x55ffff);
 background.graphics.drawRect(xbut,ybut,100,20)
 background.graphics.endFill();
 addChild(background);

 label_txt = new TextField();
 label_txt.selectable = false;
 label_txt.defaultTextFormat = new TextFormat( 'Verdana', 10, 0x000000 );
 addChild(label_txt);

 visible = true;
 mouseEnabled = false;
 label_txt.text = "TEXTO DO TOOLTIP";
 setlabel (descr);
 }

 function setlabel ( s: String ) : void {
 label_txt.autoSize = TextFieldAutoSize.LEFT;
 label_txt.width = 200;
 label_txt.multiline = label_txt.wordWrap = true;
 background.width = Math.max( 100, label_txt.textWidth + 10);
 background.height = label_txt.textHeight + 18;
 background.y = ybut + Math.round( -background.height - 16);
 background.x = 1 + xbut;
 label_txt.y = background.y + 4;
 label_txt.x = xbut + 4
 graphics.clear();
 graphics.lineStyle(0,0x000000);
 graphics.beginFill(0x55ffff);
 graphics.moveTo(xbut,ybut);
 graphics.lineTo(background.x-1,background.y+background.height+1);
 graphics.lineTo(background.x-1,background.y-1);
 graphics.lineTo(background.x+background.width+1,background.y-1);
 graphics.lineTo(background.x+background.width+1,background.y+background.height+1);
 graphics.lineTo(background.x+10,background.y+background.height+1);
 graphics.lineTo(xbut,ybut);
 }
 function OutTooltip (event:MouseEvent):void {
 this.removeChild(label_txt);
 this.removeChild(background);

 }