Bernie wrote: I've only been able to find one other app that uses TXNSetCommandEventSupport(): <http://developer.apple.com/samplecode/ HITextViewDemo/listing12.html>. Unfortunately, it also crashes on double click :-( So, either the author is making the same mistake as me or it's a bug in this new API. I've forwarded the crash report (for the above app) to Apple. Bernie, Still at 10.3.9 here at home so I'm running blind, but I wonder since this function isn't part of CarbonLib, wouldn't you have to invoke the frameworks before using it? Can't wait to give this a try under Tiger. Ken