Thank you for choosing Telerik RadOutlookBar!
Telerik RadOutlookBar control lets you deliver Outlook's navigational bar to your applications just as easy as adding a single control. You can take advantage of the group data templates, overflow menu, defining items position (define whether the items will appear in the main navigation bar or in the overflow menu by simply dragging the main navigation bars horizontal splitter).
RadOutlookBar key features list:
Integration with Telerik controls - ContextMenu, ComboBox, DropDown buttons
All Telerik controls for Silverlight support styling with Expression Blend