Hello Web Services,
I tried to build up a test demo based on your code but unfortunately to no avail because I had to remove many datasources, custom code, user controls, etc and the resultant page was not enough for reproduction. That is why what I can suggest is that you set RenderInPageRoot=true
for the tooltips and test again. In case this does not help, I want to kindly ask you to isolate the problem in a simple setup, open a new support ticket and send it to me along with detailed explanations and reproduction steps. Please, make sure that the demo is fully runnable. Once I am able to investigate the problem locally, I will do my best to help.
the Telerik team