I've just posted a new version of the GradObjects class.
Thanks to Nigel for reporting a bug that occured when using Graphical OptionGroups.
Here's the updated version.
http://weblogs.foxite.com/files/cesarchalom/gradobjects/gradobjects.zip



More info can be obtained at the original post:
GRADIENT OBJECTS WITH GDI+
http://weblogs.foxite.com/cesarchalom/archive/2006/07/26/2076.aspx