I much appreciate the code sample. You solution works perfectly. Thank you Uwe!

I did not realize your are the Qwt developer. Thank you so much for sharing your work! I can not imagine the amount of man hours that you must have put into developing such a fine widgets library. I kept wishing I was doing this charting application in C# .NET until I discovered your Qwt. I am looking forward to discovering more of what I can do with your Qwt widgets libraries. Thanks again!

-Ed