Focus of about dialog

[Vikraman Choudhury <vikraman choudhury gmail com>]

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I've added an about dialog to my gtk application, using GtkAboutDialog.
However, when the dialog is displayed, the user can still switch to the
main window, which is undesirable. The dialog should steal focus of the
whole application. How can I do that ? I have looked at
gtk_widget_set_parent_window () but couldn't get it to work.

- --
Vikraman
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