What I can suggset is using the mouseover and mouseout events to show/hide a certain div that is adjacent to the target.
I an also offer you the following script override that will render the tooltip as the last node in the parent element of its target. Note that I cannot guarantee it will function as expected and it will not result in problems. You can further customize the popup element (e.g., remove its absolute positioning) as desired. The script must be placed just before the closing </form> tag so that it is after any RadToolTip instances that may reset it.
(ttip.get_targetControl() && ttip.get_targetControl().parentNode)
formID = ttip.get_formID();
parent = formID ? document.getElementById(formID) :
(document.forms && document.forms.length > 0) parent = document.forms;
parent = document.body;
parent = getMyParent(
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