I would like to create an upx panel There is a dedicated forum If so You can put a link.
There is the Coding corner forum, but there isn't much activity there.
I think you're best bet might be here. Not a lot of people do panels, so getting answers might be hard.
Are you doing panels for just PS, or other programs?
I would like to create panels for photoshop
Then you're best bet is here. I haven't seen a lot of threads on it, but there are some people here that do them. I've been wanting to learn, but just haven't had the motivation or the necessity. Davide Barranca has a lot of good info on panels, you might want to google him.
That's a better one than I found on this forum. Just two threads on that.