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Xfce Gtk+ extensions

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Common used functions for #GtkWidget's that are not provided by
the Gtk+ library.

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<para>
These functions allow the developer to quickly create common widgets,
without the hassle of creating formatted string or a lot of code
dupplication.
</para>

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<!-- ##### FUNCTION xfce_gtk_button_new_mixed ##### -->
<para>

</para>

@stock_id: 
@label: 
@Returns: 


<!-- ##### FUNCTION xfce_gtk_frame_box_new ##### -->
<para>

</para>

@label: 
@container_return: 
@Returns: 


<!-- ##### FUNCTION xfce_gtk_frame_box_new_with_content ##### -->
<para>

</para>

@label: 
@content: 
@Returns: 


<!-- ##### FUNCTION xfce_gtk_window_center_on_active_screen ##### -->
<para>

</para>

@window: 


