Going nut with a _level10...gotoAndPlay ... inoperative ,why?

going nut with a _level10…gotoAndPlay … inoperative ,why?

The mc clip presentation.swf loads on level 10 onto index.swf ( level 0) ;

On presentation.swf´s time line there is a button with following action …

on (release) {
_level10.transitionmskmc.gotoAndPlay(“transitionmskmc2”);
}
…which seems correct to me ;

transitionmskmc is the instance name of the mc placed on
presentation.swf´s time line to be controlled by the button ;

transitionmskmc has a stop(); on frame 1 and
frame two has the label transitionmskmc2;

the strange of the whole thing is that as the button is clicked nothing happens ;

I´ve tried as well…

on (release) {
_level10.transitionmskmc.gotoAndPlay(2);
}

…with the same result during sometime and after a couple of minutes testing the mc I finally put it to work as it is above : addressing the frame , not the framel label ;
why flash is sometimes so quirky ?
Cheers