Button & movieclip problem

Hella all,

I have a prblem with a movieclip that i would like to function as a button. If I just use the movieclip as a button, nothing happens. If I transform this movieclip in a button also nothing happens. But when I remove the movieclip from the button I just created it suddenly works (if i just use hit).

So my question is: why does the code not work in combination with the movieclip???

I proejcted the code directly on the movieclip, and in a later stage on the button. The code is nothing fancy but here it is:

on(press){
    _parent.object.one.gotoAndStop("two");
}