Add a method that would position a widget first in the window tab order.

The only current method setTabOrder is insufficient in a situation where I programatically create a new Widget and want to make it the first in the taborder since it only allows placing widgets after some other widgets.

For example:
I have widgets a, b, c in this tab order in a window and want to add widget x as the first. To make x the first in the tab order I would have to call:
setTabOrder(x, a);
setTabOrder(a, b);
setTabOrder(b, c);

This is highly inconvenient.