Thank you for your anwser, but problem not solved in this way.
.Forms.Add(GetType(MKSApplication.MKSBaseApplicationFormWithNB))
I had a baseclass of MKSApplication.MKSBaseApplicationFormWithNB
in this Baseclass i had a lot of public Properties on which i want to access.
So when i try to access to Strataframe.application.mainform i can't see this properties.
How to handel this ?
thanks
Rainer