[Gambas-user] Pesky Minimize Button on TitleBar

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I can't find an answer to this problem, except for an old post on this list 
in French. My French is rustier than the wreck of the Titanic but I got the 
impression that the building of window title bars is under the control of 
the WM.

Anyway, I have a window and I need to remove the Minimise button. The 
maximise button I have dealt with. Oddly, in the gambas design environment 
the window shows with only the close box, which will do, but as soon as I 
run the application, there's the pesky Minimise button again.

Does anyone care to shed some light on this, please?