This ticket seems to be a duplicate of the another one you already post. I have already answered to your question in the private thread. I am copying the answer also here:
There are different approaches that you can use in order achieve your requirement. One way that we can suggest trying is to define RadToolTip in code and programmatically manage its visibility. So, on MouseEnter event of the autocomplete element, you can set the IsOpen property of the ToolTip to true and close it when the button inside is clicked or you can use a timer to close it after a while, or use the MouseLeave event.
We have created a sample project which demonstrates this suggestion. Please, give this project a try and let us know if this works for you.
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