I believe the sequence is as follows, at least this works on the CX995:

1. Stop (if playing)
2. delay 5 seconds
3. Display
4. delay 0.5 seconds
5. Enter
6. [Disk #]
7. Enter
8. delay 4 sec
9. Display
10. delay 5 sec
11. Display

Then about 9 seconds to load.

It's a pain but it works on the CX995, I'm guessing it's about the same for the CX960. I hope this helps.
I have a pronto with the rs232 extender so I'm just going to bite the bullet and get the CX7000ES for a blu-ray changer just to avoid this.