I am afraid that the provided infirmation is not enough to understand what is the problem. Would you please clarify the following:
1) Do you use a RadToolTipManager or separate RadToolTips?
2) How exactly you tooltipify the columns/elements?
3) Do you tooltipify each element in the column or you want to tooltipify only the header?
4) What is the markup declaration of the RadToolTip/RadToolTipManager ?
5) Where you actually want to show the tooltip and relative to the mouse, element or browser?
It will be best if you provide any additional information and code which can help us to better understand your setup.
All the best,
the Telerik team
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