In several research I have done to find out how I can group multiple instruments in a single track (in my case I use the Kontakt 5), the most elegant I found was the sending of Bank/Patch Changes (Program Changes).
I can see the patch changes signs at track view, but I can not for the Piano Roll View.
Would anyone tell me how can I view the program changes in PRV?

The PRV cannot show program change messages. The Event List view will let you add/show/edit them.
 
 

Is there any way to visualize bank changes in Track View?

Please put in a feature request in the feedback forum.   I've wanted this too.   My workaround is to always keep an Event List window open that parallels the selected track in PRV.    This requires an extra monitor, or enough screen space, though, plus the extra housekeeping to keep both windows focused on the correct track. 

williamcopper
Please put in a feature request in the feedback forum.   I've wanted this too.   My workaround is to always keep an Event List window open that parallels the selected track in PRV.    This requires an extra monitor, or enough screen space, though, plus the extra housekeeping to keep both windows focused on the correct track. 

It's there: http://forum.cakewalk.com/FindPost/3251820