[akc.666]

Была подобная проблема... Попробуйте так:

#initclip
function pSelectGroup () {
	this.Name = "";
	this.SetVendors ("ffffff")
}
pSelectGroup.prototype = new MovieClip ();
Object.registerClass ("CSelectGroup", pSelectGroup);
pSelectGroup.prototype.SetVendors = function (val) {
	var mc = this.attachMovie ("mcVendorCaption", "vendorCaption", 0);
	mc.mcvCaption.text = val;
	this.onEnterFrame = onEnterFrameHendler;
};
pSelectGroup.prototype.press = function () {
	trace ("asdf");
};
pSelectGroup.prototype.onEnterFrameHendler= function () {
	delete this.onEnterFrame;
	this.vendorCaption.onPress = this.press;
};
#endinitclip