I am using SPCApplicationUserControl. It is weired that my first plot always dispapears. It is supposed shown on the vertical MEAN/RANGE bar. I can see my data in the above data display area.
Sorry, but we are not sure what you are describing.
Are you running our SPCApplication1 example program exactly as we wrote it? Or did you make changes. Did it work up until the time you made changes ?
We don't know what "It is supposed shown on the vertical MEAN/RANGE bar. " means.
Try deleting the SPCApplicationUserControl from the form and placing it again.
Send a image capture of your problem, annotate it in Paint, and send it to support@quinn-curtis.com so that we have better idea what you are trying to describe.