Nathan,

>I've seen this before when a form does not have a parameter-less constructor. I'm assuming that since VS can't provide any parameters at design time, the form can't be opened in the designer. mmBusinessForm only has one exposed constructor, and it takes a BizRule parameter. In my forms when I have constructors that take parameters, i keep one protected parameter-less constructor intact. That way it's still there for VS, but that constructor can't be called in code. I don't know if this is why I can't edit mmBrokenRulesForm-derived forms, but it's my guess.

Unfortunately, you're right...this is a VS .NET "issue", that can be fixed by adding a parameterless constructor to the base form. I've done so and this will appear in the next release of MM .NET. If you need this change sooner than later, let me know and I'll give you access to a pre-release version.

Regards,