I think my words has been very misleading. Very sorry for that Radioman .
Let me put this question in another way from the demo(WPF)
1.Draw a route between by selecting two points near New York.
2. Now using geo Textbox navigate to Paris where we can see our route is visible
3. Pan the Map.(the route disappears)
4. Now again using geo navigate back to New York(the route is not visible)
5. Pan the Map(the route appears)
How to make the route disappear with out pan and reappear with out pan?