[Obi]

Ну вот как-то так:

var newMovieClip:MovieClip = _root.createEmptyMovieClip(mcName,Depth);
var newPromtTxt:TextField = newMovieClip.createTextField("promtTxt", Depth, 0, 0, 200, 1);

point1X = newPromtTxt._x-3;
point1Y = newPromtTxt._y-3;
point2X = newPromtTxt._x +newPromtTxt._width+3;
point2Y = newPromtTxt._y +newPromtTxt._height+3;
newMovieClip.lineStyle(1,borderColor,alpha);
newMovieClip.beginFill(BgColor,alpha);
newMovieClip.moveTo(point1X,point1Y);
newMovieClip.lineTo(point1X,point2Y);
newMovieClip.lineTo(point2X, point2Y);
newMovieClip.lineTo(point2X, point1Y);
newMovieClip.lineTo(point1X, point1Y);