Assembly: System.Windows.Browser (in System.Windows.Browser.dll)
ASP.NET AJAX behaviors and controls have a common event signature:
The first parameter is a reference to the ASP.NET AJAX control or behavior that raised the event.
The second parameter is an arbitrary complex type.
You could create a custom event delegate to provide this functionality. Because this is a common need, the class is provided as a convenience.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.