In my experience this is a bad idea. The breadcrumb is not a good analogy for how a user best uses QV. A QV can be navigated to and from any direction -- that's it's strength.
I've heard the analogy of a Supermarket used. With traditional query products, you enter the Front Door and proceed to the Soap isle to pick up soap. Next you want Milk, so you head back to the Front Door and then to the Milk isle.
With Qlikview you go Front Door -> Soap -> Milk. No need to return to the front door.
So a typical QV sheet interaction may be Main->Sheet1->Sheet2 or it may be Main->Sheet4->Sheet1->Main. What use is a breadcrumb in either case?