How can I check if a GtkWidget exists?

[Frank Cox <theatre melvilletheatre com>]

How can I check if a GtkWidget exists?

I am planning to create and destroy widgets in a window depending on the user's
selections, but I can't figure out how to determine if a particular widget
already exists in the window so it won't be created twice or receive a
second deletion attempt if it's already gone.

I tried checking GTK_WIDGET_REALIZED but it appears that if the widget has
previously been destroyed then the GTK_WIDGET_REALIZED tries to access it
anyway and gives me an error.

Is there a way to determine if a widget is already in a window without having
to maintain my own table?

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