Toolbar, float an item to the far right of the toolbar

I have a toolbar with 3 buttons.
They all display by default left to right inside the toolbar.
What I would like to be able to do is to have the last button float all the way to the far right of the toolbar container whilst the other two buttons keep their float:left behaivor.

You may use spacer functionality:

dhtmlxToolbar/samples/01_init/13_spacer.html