UFT Web Add-in Extensibility enables you to develop support for testing third-party and custom Web controls that are not supported out-of-the-box by the UFT Web Add-in.
If the test object class that UFT uses to represent a control does not provide the operations and properties necessary to operate on your control, you can use Web Add-in Extensibility to create a new test object class.
You can also teach UFT to treat a control that contains a set of lower-level controls as a single functional control, instead of relating to each lower-level control separately.
To implement Web Add-in Extensibility, you need to be familiar with:
UFT and its Object Model Reference
The behavior of the custom control (operations, properties, events)
XML (basic knowledge)