[Nox Noctis]

а лучше так:

TF.onSetFocus = function() {
	_root.onEnterFrame = function() {
		TF._y = rect._y+rect._height-TF._height;
		TF.autoSize = (TF.textHeight+10<rect._height);
	};
};
TF.onKillFocus = function() {
	delete _root.onEnterFrame;
};