Rollover buttons inside movieclip doesn't work

Hi guys
sorry i have this stupid beginner problem here
and I have tried to search related issues but I still can’t figure the way to make my buttons work

http://www.angiehu.com/upload/showroom/test2.fla

here is my fla file…
Basically I have a rollover buttons inside a movieclip and my action script in the first frame of the scene is the following
_root.designer_mc.b1_01.onPress=function(){
goto(“designer01”);
}
b1_01 is the instance of the button inside designer_mc movieclip~ however I realized that buttons won’t work in movieclip
and i just don’t know what’s other solution

I will be really appreciated if anyone can teach me how to get this fixed~ i m so stuck and I have wasted my past 2 days trying to figure this out and still no result…
I have learned flash at least 5 years ago and now I found out that actionscript works a lot different than before and I can’t make things work (damn it)