Generally, you do not need to implement this interface. It is implemented by built-in test controls in the DevExpress.ExpressApp.EasyTest.WinAdapter.v19.2.dll and DevExpress.ExpressApp.EasyTest.WebAdapter.v19.2.dll assemblies. To create the ITestControl object, use the approach described in the How to: Implement a Custom EasyTest Command topic. Use the ITestControl.GetInterface<T> or ITestControl.FindInterface<T> methods to access members, specific to certain test control types. The following test control interfaces can be used as generic parameters.