I just need to move one specific button that is all alone in it's own group. Both of these methods look like they would align the entire toolbar to the right which is not what I want. 

Look again at the image, that is exactly what I am trying to recreate. The main button group on the left is aligned to the left while the lone button on the right is up in the right corner. One button, that's it. 

        <item type="g_start" />
        <item type="holder" name="FullScreen" />
        <item type="g_end" />

Is there any way to give that group an ID so I can reference it later?