Right justifya toolbar button

Is it possible to right justify a series of buttons on a toolbar?

On my main toolbar I have most of my buttons positioned left to right but I have a few that I want to position over on the right side. If I include a spacer to push them to the windows edge, it works fine in Maximized view mode. But when I resize the windows, the buttons aren't viewable.

While in Customize mode, right-click the spacer and set it to Full Width so it eats up the spare space.