I am trying to see if it's even possible to select a certain peak label, or zoom in the graph with a selected area, or make sure a certain peak has a certain height kind of things. Is it possible to do it with TestComplete? If not, is there some other tools that can do that? Thanks!
TC doesn't support this control, however, you should be able to work with it via its native properties and methods as in the application's code.
If you do not manage to find a way to work with the control, please send us a sample application containing it at firstname.lastname@example.org (include debug info for the application).