Can you check the values of "line" and "page" scroll in your control? It seems that it doesn't match, and that the control is not erasing the previous lines. BTW, a bit of your code (creation and/or both click messages) would be helpfull
Regards. -------- M.D.V. ;) If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about? Help me to understand what I'm saying, and I'll explain it better to you “The First Rule of Program Optimization: Don't do it. The Second Rule of Program Optimization (for experts only!): Don't do it yet.” - Michael A. Jackson Rating helpfull answers is nice, but saying thanks can be even nicer.