A new WPF Ribbon Control will be available for
download shortly after the release of WPF 4. It features skins for Windows 7
and Office, as well as all the standard Ribbon features that end-users are
familiar with, including tabs and groups, dynamic resizing, quick access
toolbar, application menu, contextual tabs, key tips, and more.
Figure 2
The WPF Ribbon will be fully extensible to meet changing
guidelines for future releases. A CTP with a limited feature set is available
today here