Lori,

zzFactoryDesktop WinFactory = (zzFactoryDesktop)Factory;  //error here

>However, this does not work. We are getting an error on the line I have noted, saying the specified cast is not valid. First off, can mmMessageBox be subclassed to change properties such as color, font, etc...? Second, are we going about this the correct way? If we are not doing it properly, how should this be done?

If you're getting a casting error on this line, it means that the Factory variable does not contain an instance of your zzFactoryDesktop class. You really shouldn't have to create a subclass of zzFactoryDesktop...you've already got an application-specific subclass in your project--Factory.cs/vb.

I took a look at what you were trying to do and realized I can make this easier for you by changing a few lines of code at the MM .NET level. If I gave you the source code, do you folks know how to recompile MM .NET?

Regards,