based on the instructions How To Route Between two location in blackberry
I tried this example for blackberry and get the result (distance between the two locations correctly as described in the example).
but after running the code I can se the road but I can't see the map behind the road
this is the pic describe my problem

so what is the problem? cause I face this problem in each map application i test it.
Have you tried on a real device? My experience has shown that the OS5 simulators are extremely unreliable in their ability to download/display maps. You could also try an OS6 simulator -- I have had much better luck with those.