RadToolTip for ASP.NET AJAX Version Q3 2008 released 11/25/2008 (release history)

RadToolTipManager vs RadToolTip

You can achieve the same result by using bothRadToolTipManager and RadToolTip controls. However, for different scenarios it is much better to use one of the controls because there are some differences in both implementations which make them suitable for different setups.

1. When to use the RadToolTipManager control
   
   The RadToolTipManager's main advantage is that it allows loading tooltips' content on demand using AJAX, in the RadToolTipManager's OnAjaxUpdate eventhandler. Furthermore, this approach is suitable for scenarios with WebServices.When using the RadToolTipManager control you should iterate through the controls you want to tooltipify and add them to the manager's TargetControls collection. In case you want to replace all the standard browser tooltips with RadToolTips, it is enough only to add a RadToolTipManager control with and empty TargetControls collection on the page - the manager automatically will tooltipify all the controls.



2. When to use the RadToolTip control
   
   It is more comfortable to use the RadToolTip control when you want to tooltipify a single element. The RadToolTip control can also be included in Item Templates and its content can be set through declarative binding. This requires little code, in fact just a declarative setting. In this case, the content is not updated through AJAX, it is constant.