NNMi change Analysis -> Performance pane?
This time it is not possible to modify any performance widgets neither the dashboards nor the performance tab in analysis pane. I hope HP will add those features to NNMi in the next minor release.
If you want to graph the custom poller, you have to graph the used MIB expression in a separate window.
Open the MIB expression and select "Tools -> Graph MIB Expression".
There is no other way to graph custom polls this time.