Add the option for radButton to verify if enabled in the offline step builder.

Steps to reproduce:

1. Start recording a WPF test. 
2. Select a radButton in the DOM explorer and build a step for it.
3. In the verification section there is an option for a step to verify if button is enabled.
   
4. Try to add a verify if enabled step for the same already recorded element in the Step Builder. 
   

Expected: The option for verify if enabled step to be available. 

Actual: The option is not available.