We recently showed a number of screenshots of the Office 2010 theme updates coming to Ribbon for WPF in our 2010.2 version. Today I’d like to show the addition of a new toggle minimization button that you can optionally include in the set of controls that appear on the right side of the Ribbon’s tabs:

In this screenshot you can see the mouse hovered over the button. Clicking it will toggle the Ribbon’s minimization state.

Clicking it again will restore the Ribbon to full view. This is the same functionality as double-clicking on the tabs.
This new control will be included in the WPF Studio 2010.2 release, due in the next couple weeks.