The control's method you need to use depends solely on the control's type. First of all, make sure that the tested application is compiled with debug information - this will help TestComplete recognize the control's methods and properties (see the "Debug Info Agent" help topic for more information). After that, I recommend that you check whether the control is specially supported by TestComplete (see the "Working With Custom Controls" help topic for more information). If the control is supported, you will be able to find the needed information in the corresponding help topic. If the control is not specially supported, but is inherited from one of the supported controls (you can ask the application's developers about this), you should map the control as one of the supported controls via the Object Mapping feature (see the "Object Mapping" help topic for more information) and work with the control just like it is the supported control. If the control is not specially supported and is not inherited from one of the supported control, you will need to examine the control's native methods and properties (and probably discuss this question with the application's developers) in order to find the methods/properties which can be used to select the needed node. Note that the methods/properties will only be available if the application is compiled with debug information.