UserForm OptionButton in Excel VBA - Explained with Examples
excel - VBA userform to execute selections only after hitting command button - Stack Overflow
Do My Excel Blog: EXCEL VBA - How to link Option buttons together in a VBA Userform
Mehrere OptionButton mit CommandButton nacheinander durchschalten - Visual Basic for Applications (VBA) - VB-Paradise 2.0 – Die große Visual-Basic- und .NET-Community