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When you use the navigation functions that allow to navigate to a certain child, the widget must be already realized. You can check it with <code>gtk.WidgetFlags.realized</code>. If you want to call it during the initialization process you can use the navigation function inside a callback to the “realized” signal. | When you use the navigation functions that allow to navigate to a certain child, the widget must be already realized. You can check it with <code>gtk.WidgetFlags.realized</code>. If you want to call it during the initialization process you can use the navigation function inside a callback to the “realized” signal. | ||
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