This functionality is supported only if you are using the Classic Agent.
In addition to the 4Test classes provided in Silk Test Classic, support for Visual Basic with ActiveX controls includes predefined class definitions for:
These definitions are provided in a file as a convenience to help you quickly get started testing your applications.
Property names that begin with the prefix VB, for example, rVBHeight of the OLEAniPushButton class, are available only in Visual Basic applications. These properties are added to an ActiveX control by the Visual Basic environment. They are not available in C/C++ environments.
If your application contains only those controls shipped with the Microsoft Windows Visual Basic Professional Edition, then you do not need to record additional classes. If you are not sure, review the controls in your application and compare them to the table in the list of controls.