Returns an internal child of a buildable.
#GtkDialog implements this to give access to its @vbox, making
it possible to add children to the vbox in a UI definition.
Implement this if the buildable has internal children that may
need to be accessed from a UI definition.
Returns an internal child of a buildable. #GtkDialog implements this to give access to its @vbox, making it possible to add children to the vbox in a UI definition. Implement this if the buildable has internal children that may need to be accessed from a UI definition.