Now I Can't...am I pressing the wrong key or has the feature left the building?
 
Thanks in Advance, Shawn Lee Farrell
 

Hold ctrl+shift while dragging the clip end. I think this changed so you wouldn't need to remember different shortcuts for SONAR and Melodyne, but don't quote me on that.

Hi. If on X3, Ctrl+drag should work. 
Have you tried to bounce the clip to itself, before stretching?
All the best.

As Craig says, on the newest versions of SONAR, this changed to Ctrl+Shift+drag some time ago.
 

I've got X3 I'll try thanks!

Thanks Zargg, didn't notice X3 in the sig...I keep forgetting that some people haven't updated. 

guilty

Only works on regular audio clips otherwise, you will need to bounce the clip first
https://www.cakewalk.com/Documentation?product=SONAR%20X3&language=3&help=AudioSnap.19.html
 

ok I should have said X3 but switching key commands from version to version seems uncool...
 
Thank you Scook, Zarg & Sir Anderton. -S

Incidentally, I have fixed a number of small problems with this, like stretching a vocalist's note a little so it starts on time without ending too soon.  It is amazing that this sounds as natural as it does.
 
I normally fix stuff like this in Melodyne, but sometimes I notice something after I have already finished in Melodyne and bounced the clip--and this trick is mighty handy.