GtkUIManager constructing menus and toolbars from an XML description A #GtkUIManager constructs a user interface (menus and toolbars) from one or more UI definitions, which reference actions from one or ore action groups. @parent: @Returns: @self: @action_group: @pos: @self: @action_group: @self: @Returns: @self: @Returns: @self: @path: @Returns: @self: @buffer: @length: @error: @Returns: @self: @filename: @error: @Returns: @self: @merge_id: @self: @Returns: