If a sort function is set, the widget will actually be inserted
at the calculated position and this function has the same effect
as gtk.container.Container.add.
If position is -1, or larger than the total number of children
in the box, then the widget will be appended to the end.
Inserts the widget into box at position.
If a sort function is set, the widget will actually be inserted at the calculated position and this function has the same effect as gtk.container.Container.add.
If position is -1, or larger than the total number of children in the box, then the widget will be appended to the end.