[Gambas-user] How to open main form in the centre of any screen

[andy2]

I have problem to open my software at the centre of my screen. Actually 
i use  the following code:

PUBLIC SUB Main()
  fMain.x = fMain.ScreenX / 2
  fMain.y = fMain.ScreenY + 200
  fMain.Show
END

But this code doesn't work very well. Thanks for your attention.

Andy