Please examine the code-behind of the demo carefully. You will see that in the RadGrid1_ItemDataBound event where the target controls are added to the RadToolTipManager the value each entry holds is extracted from the grid and is passed to the Value string of the tooltip. This is done with the following line:
The first parameter is the ID of the HTML element that will be tooltipified, the second is the internally handled Value property which can be obtained in the OnAjaxUpdate event of the RadToolTipManager:
and the third is a flag that indicates it fhe first parameter is the server ID or the calculated ClientID of the target element.
the Telerik team
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