Ribbon Auto-hide Mode
BCGControlBar Pro (MFC)
BCGControlBar for .NET
When auto-hide mode is on, the Ribbon bar is replaced with a thin bar and when user clicks this bar, the Ribbon bar appear as a popup window.
Please note that auto-hide mode is not compatible with a Ribbon DWM ("aero") caption, therefore auto-hide mode will be automatically closed when user activates an "aero" visual theme (e.g. Office 2007 or 2010).