Hi Scott,
Our apologies for the delayed response. For EditControl.CommentSelection method to work properly the StartComment attribute of ConfigLanguage tag of the language configuration definition has to be defined in the XML configuration file.
Example:
For C# :
I have attached a sample that illustrates this in this link given below.
Sample
Please let me know if this meets your requirements.
Thanks for your patience.
Regards,
Manohari.R