Adds a child. The @type parameter can be used to
differentiate the kind of child. gtk.widget.Widget implements this
to add event controllers to the widget, gtk.notebook.Notebook uses
the @type to distinguish between page labels (of type "page-label")
and normal children.
Adds a child. The @type parameter can be used to differentiate the kind of child. gtk.widget.Widget implements this to add event controllers to the widget, gtk.notebook.Notebook uses the @type to distinguish between page labels (of type "page-label") and normal children.