[gtkmm] Simple question about popup windows

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Does anybody now how to make a window get all the viewable area of the 
display?

I want to spawn a window of 1280x0124 in a display of 1280x1024. I create 
the window as a popup_window and its works well until the user clicks the 
mouse over the created window, in that moment the desktop panel appears in 
the botton part of the display.

Is there a way to avoid this behaviour (form the GTK, the X server 
configuration or GNOME desktop configuration)?

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