RadControls for ASP.NET AJAX
There are many cases when you want you grid to show a tooltip when an item is hovered with the mouse. Tooltips are understood by screen readers and can be used as an accessibility feature.
In brief you need to handle either ItemDataBound or ItemCreatedEvent. There are two possible scenarios.In the first one you show the tooltips only when GridHeaderItem is hovered. In this case you should check in the event handler if e.Item is GridHeaderItem.
The second scenario is when the tooltips will be shown for any grid item. In this case you should check if e.Item is GridDataItem.
Consider the example below: