// enable XP theming (a.k.a. "visual styles"),
    // but only if newer OS and the feature is available
    if ((Environment.OSVersion.Version.Major >= 5) &&
        (Environment.OSVersion.Version.Minor > 0))
    {
       if (OSFeature.Feature.IsPresent(OSFeature.Themes))
       {
          Application.EnableVisualStyles();
          Application.DoEvents();
       }
    }