XLN Audio chooses not to add the data needed for SONAR to display kit piece names. FXpansion's BFD3 and Cakewalk's Session Drummer 3 both illustrate how plug-ins can communicate kit piece name data. Because XLN Audio refuses to implement the appropriate VST opcode, to add kit piece names in SONAR you will need to use a drum map in the instrument/MIDI track of AD2. Here is a
blog article with a drum map preset and templates for AD2.