Combobox ! function

i’ve a function on a frame. i call that function from the same frame, and it works. but if i call that function from a combobox it doesn’t work. i traced my code and found out that the exec. goes to that line where i call that function in combobox, but it still doesn’t call that function. you guys know why?

edit: forgot to write this down:
combobox action is on(change){}
i don’t want to use a function for that…