The following two Python GTK programs behave differently with respect to the widow manager's 'ALT-TAB' functionality (Move between windows using a popup window, by default bound to ALT-TAB). I think, perhaps naively, that they should behave the same in this respect.
With this program the dialog box appears in the ALT-TAB window, and you can ALT-TAB to and from this dialog box:
dialog = gtk.Dialog()
With this program, the dialog box does not show up in ALT-TAB window, and you can not get to this dialog box with ALT-TAB:
dialog = gtk.MessageDialog()
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