Synchronizing Combo Boxes (1 Viewer)

[lilAndy]

Has anyone ever had any luck synchronizing multiple combo-boxes?
I've played around with the two-combo-box functionality, but it isn't suitable to my needs.
I'm attempting to use 4 combo-boxes and it's really starting to mess with my head now. I'm not sure if I'm complicating it more than it should be. I'm going to carry on working with it until I get it right, but if anyone has any useful comments then please let me know.
Obviously, a lot of this process has to be done in code.

 

[lilAndy]

Okay, I think I've finally got it sorted, though it is a bit of a messy-looking solution (but only because I know what the code looks like). It does seem to be working perfectly, after a lot of debugging.