Again much thanks for your fast reply.
I've forgotten to say that the user should have the ability to click on the signal to test it.
So I hoped to create the application in a short time using buttons. But I aggree with you, that perhaps it is the better way to do it in the way like your suggestion is. But never the less I can't understand why Windows or VC++ makes troubles if you want to have 400 buttons!
Ok, in any way lot of thanks for your time and your thoughts.

With best regards

Ralph Wuppinger