A button in a form simply returns the value of it's selector if pressed. The type number for a button is 0. The special value zero for the selector creates an inactive textbox, which does not react on a touch.
A button is display as a textbox.
Example:
forminit formentry "One", 5,30,65,44, 1, 10 formentry "Two", 5,50,65,64, 1, 20 formentry "Three",5,70,65,84, 1, 30 formdisplay $m1 formtouch sel messagebox "Selected:"+string(sel) goto m1