Detailed planning of how you want UFT One to recognize the custom controls enables you to correctly build the fundamental elements of the .NET Add-in Extensibility support set. Generally, to plan the support set, you:
Determine the .NET Windows Forms controls for which you need to customize support.
Plan the test object model by determining which test objects and operations you want to support based on the controls and business processes you need to test.
Plan the most appropriate way for implementing the support.
For more information, see Planning Your Support Set.