Would you please share fully runnable source code? As far as I can see from your code it is expected that a tooltip should show on mouse over because of the following line:
tooltip = tooltipManager.createToolTip(element);
There is no condition and thus it will create a new tooltip every time. This means that it is possible that the previous tooltip was disposed and the tooltip which is shown is a newly created one. However, this depends a lot on your logic and where you call this function - that is why I will need to examine a fully runnable page. Provide also explanations of the exact desired and actual result and the differences between them and I will do my best to help.
All the best,
the Telerik team
Watch a video
on how to optimize your support resource searches and check out more tips
on the blogs.
Follow the status of features or bugs in PITS
and vote for them to affect their priority.