That is the problem, my GTK version is too old. Thanks.

On jue, 2011-01-13 at 10:49 -0800, ZuLuuuuuu wrote:
> Might that be related with your GTK+ version? gtk_widget_get_visible () is
> available from 2.18 on.
> 
> -----
> Canol Gökel


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