Hello Wolfgang,

Thank you for posting in our forum.

The styling of the grid, as well as all other controls in OutlookCRM sample is achieved with style library. You can create your own style libraries with Infragistics AppStylist. This is a stand-alone application that lets you style every detail of your application. More about AppStylist you may find by following the next link http://help.infragistics.com/Doc/WinForms/current/CLR4.0/?page=Styling_Guide_Overview_of_Styles_Presets_and_Themes.html

When your style library is ready you can load it with Load method of the StyleManager class. You can find more information about loading of style library by following the link bellow http://help.infragistics.com/Doc/WinForms/current/CLR4.0/?page=Styling_Guide_Loading_a_StyleLibrary.html

Please let me know if you need any further assistance.