Create a gtk_message_dialog parent-less but focused

[Francesco Montorsi <f18m_cpp217828 yahoo it>]

Hi,
     I need to create a gtk_message_dialog with a NULL parent and then 
run it with gtk_dialog_run(). Unfortunately the result is a message 
dialog _without_ the focus (the WM draws the decorations with the 
"non-focused" window color)...

   how can I force the focus on that message dialog?

Thanks,
Francesco

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