Wieha! It works! Thanks a lot Alec. Greetings from a happy Belgian :-)

Wieha! It works! Thanks a lot Alec. Greetings from a happy Belgian :-)

I think I understand your code, cool stuff! But when I try it, it won't work - the second window opens in a flash and becomes immediately invisible or something, I have to interrupt the computation becauset the 'Main' window is gone... Any suggestions?

I think I understand your code, cool stuff! But when I try it, it won't work - the second window opens in a flash and becomes immediately invisible or something, I have to interrupt the computation becauset the 'Main' window is gone... Any suggestions?