Finalizing XXX, but it still has children left, when using Builder UI XML

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I am building a reasonably sized GUI using Rust Gtk and using XML .ui files to define my interface. I was having a problem that as I partitioned the UI into many files (approx 16) I kept getting warning messages, when closing my windows, that said

Finalizing MySubClass, but it still has children left,

Searching the web provided no answers, but I did find the cause.
My Subclasses were all subclassing GtkWidget, changing this to GtkBox removed the warnings.
Obvious now that I know, GtkWidget does not remove its children, but GtkBox will do just that.

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If you are subclassing GtkWidget then you have the responsibility to remove the widgets you added. That is done in the dispose() virtual function.

For template widgets, you can call gtk_widget_dispose_template(); for widgets added manually through gtk_widget_set_parent() you will need to call gtk_widget_unparent().

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