Sounds a mess, Wilfried!
At first it seems that a route's coordinates can be extracted and these could be used to draw a polyline shape. However, the locations supplied by MapPoint are intended for "ideal viewing" of each segment, and not for reproducing the route.
One solution (used by TourSolver - see my website for details) is to use your own data and routing engine. This works well but the data costs, of course.
Richard