[tompad]

Originally Posted by Lokasenna

The exec method specifically calls the function assigned to func, so yes - if you overwrite mouseup directly to add our code instead of passing a function, exec won't work.

I am not sure I understand right.....

What I did was to replace

 function GUI.elms.Start_Cont_Button:onmouseup()
  GUI.Button.onmouseup(self)
-- Lots of code  
end

with

 function startButton()
 -- Lots of code
end

and added func = startButton to GUI.New ("Start_Cont_Button")-table
like this:

GUI.New("Start_Cont_Button", "Button", {
  z = 11,
  x = 32.0,
  y = 128.0,
  w = 100,
  h = 30,
  caption = "START!",
  font = 2,
  col_txt = "txt",
  col_fill = "elm_frame",
  func = startButton
})

But clicking the button did nothing. ? Shouldn't that do the thing?
Trying to understand ....but....dont.

The solution I had worked though.