Target is correct, but button no works

I used as usual:

this.menu_buttons_mc.menu_01_mc.menu_01_btn.onRelease = function ()
{
trace (“this.menu_buttons_mc.menu_01_mc.menu_01_btn.onRelease CALLED”);
};

But problem ist : it works only for one btn.
Why?

Try click the second flake from above and see AS layer please.

I think it would be easy for you but diffic. for me.

Please see attached file.