>Changing from:
>
>public class MyNewForm : mmBusinessForm
>
>to
>
>public class MyNewForm : OakLeaf.MM.Main.Windows.Forms.mmBusinessForm
>
>solved the problem. Is it correct?

You COULD do it this way, but if you check the MM .NET Dev Guide, it mentions that you need to add a "using" statement to the top of the source code file. For example:

In C#:

using OakLeaf.MM.Main.Windows.Forms;

In VB .NET:

Imports OakLeaf.MM.Main.Windows.Forms

Regards,