Marc,
If you select the template drop graphic and zoom into the beginning you will notice a direction arrow. There should be another at the other end of the corridor. Sometimes both arrows appear at the beginning (or at some point in between). Grab the arrow pointing to the end and drag it to the end of the template's station range. Use the AccuSnap tentitive snap to snap it to the end and you should see the template drop graphic reshape itself to the corridor graphic.
I'm not always clear with what I say so let me know just how unclear I am on the explanation and I'll try to be clearer.
Paul