This question is locked. New answers and comments are not allowed.
I added code to enable a chart trackball according to the documentation, and when I run my chart--nothing happens. I do have my delegate configured properly, and can capture other events etc without problems.
Just to compare, I compiled and ran the Chart/Trackball annotation part of the TelerikUIExamples project. It doesn't display a trackball either. Tried this both with the Swift and Objective-C versions of the demo program. I tried running the program on the latest simulator image, and an older iOS 8.4 image -- neither displays the trackball information that's setup in the code.
Is the trackball feature broken in Q1/16?
I'm running:
Telerik UI iOS Q1/2016
Xcode 7.2 on OSX 10.11.3
Physical Device: iOS 9.2.1 on iPad Air 2