For each custom control that you want to support, you develop a custom server class, that derives from the CustomServerBase class. The resulting custom server DLL runs in the context of the application and interfaces between UFT One and the custom control. At UFT One's request, it can retrieve the values of identification properties from the control, perform operations on the control, or determine what steps to record in response to user activity on the control. You can compile more than one custom server into a single DLL.
UFT One 2022 and later: Following the discontinuance of the Silverlight development framework, UFT One no longer supports the Silverlight Add-in out of the box.
If you need to use and extend the Silverlight Add-in, contact OpenText Support.