note zwon <p>Welcome to the monastery! <blockquote><em>Can anyone please tell me whats missing?</em></blockquote> The code that fails. Without the code it's hard to tell what's the problem. Can you please provide us with code snippet that causes error? Also please read [id://174051] <p><b>Update:</b> there's such thing as MainWindow when you're using [mod://Tk] package, and that's not the same as [mod://Tkx], so perhaps you just mixed up these two packages. 799118 799118