Thank you for your feedback, I understand your concern and I see your point. Actually, the tooltip works as you explain with the other events as click, etc. However, especially for the mouse over event we have decided not to cancel the bubbling because of many integration scenarios, e.g with RadComboBox, RadMenu, etc which need it.
What I can suggest is the following:
1) Use another event e.g click
2) If you want I can provide you with code which overrides the default behavior for mouse over as well. Note, however, that we do not recommend to override private functionality and you should extensively test your own project for possible problems which might occur as a result of this change. Note, also, that overriding private methods might result in problems in later upgrades if this code changes on our side. That is why we do not recommend this but if you decide to use this approach and to support possible problems this might cause, just let me know and I will provide you with the code in question.
On a side note, since you are the second or third person who asks about this, I forwarded it for future consideration we might introduce a property to control this but this depends on further discussions and feedback we receive.
I hope that my reply is helpful, let me know what you decide or whether I can be of help.
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