The xamRibbon™ Screen Tip is an enhanced ToolTip that you can use for any Ribbon tool that exposes a ToolTip property. You simply set the ToolTip property to an instance of a xamRibbonScreenTip.
The xamRibbonScreenTip class derives from the xamScreenTip class which derives from Microsoft Windows Presentation Foundation’s System.Windows.Controls.ToolTip class. Therefore, you can use xamRibbonScreenTip in the same fashion as a standard .NET Framework ToolTip control. However, unlike the .NET Framework ToolTips, xamRibbon Screen Tips provide added functionality that will restrict its own size so that it conforms to Microsoft® Office® UI guidelines. Along with the auto sizing functionality, xamRibbon Screen Tips allow you to display a header, footer, and an image to give your end users a better idea of what a specific Ribbon tool will do.