popup menu and button

I want to use popup menu and button that control play video. For example: If one, two ,three there are three chooses and I must first one of them and use button control play it.

current I think use the way

switch get(hpop,'value') case 1 set(hp1,'callback','f1');

    case 2

       set(hp1 ,'callback','f2'); 
    case 3

       set(hp1 ,'callback','f4'); 
end

but this code can't work. pleas give me some advices,thanks!!