My BreadCrumb that was linked to my TreeView worked for a while and then I got this error:
You cannot add or insert the term in more than one place. You must first remove it from its correct location or clone it.
I deleted the BreadCrumb and my program worked again.
I tried later to add back it in. The program wouldn't run at all (No error messages). I tried just adding the BreadCrumb control and not attaching it to anything. It still wouldn't run. I deleted the BreadCrumb and the program runs again.
I tried making a new program with just a BreadCrumb and a TreeView. When I ran it. It when right away into Break Mode.
I did your tutorial where you used a BreadCrumb with TreeView. Same thing. The program went immediately into Break Mode.