Sets the child widget of menu_button.
Setting a child resets gtk.menu_button.MenuButton.utf8 and propertyGtk.MenuButton:icon-name.
If propertyGtk.MenuButton:always-show-arrow is set to TRUE and gtk.menu_button.MenuButton.ArrowType is not gtk.types.ArrowType.None, a dropdown arrow will be shown next to the child.
the child widget
Sets the child widget of menu_button.
Setting a child resets gtk.menu_button.MenuButton.utf8 and propertyGtk.MenuButton:icon-name.
If propertyGtk.MenuButton:always-show-arrow is set to TRUE and gtk.menu_button.MenuButton.ArrowType is not gtk.types.ArrowType.None, a dropdown arrow will be shown next to the child.