[GtkGLExt] keyboard focus

[Norman Goldstein <normvcr telus net>]

My window only receives keyboard events after I click in the window.
How can I programmatically set the window to have keyboard focus at startup?
My window inherits directly from FXMainWindow.

I have tried setFocu() and enable(), and have also overriden the 
canFocus() virtual method to return true, but all to no avail.

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