I have the following problem

I created a form with a text box and a command button to leave the screen.

In the valid clause of my text box, i put the following code

if empty(myfield)
messagebox("This field is mandatiory......")
return 0
else
return 1
endif

The problem is i want to quit the form when i click on my button even if myfield is empty, but in my example i can not leave the screen.

Has someone a solution

Thanks a lot