May be it works if you don't put YMML in as the destination airfield. If you put YPAD as the departure field, and YMML as the destination then either drag or write in the route, it defaults to the NDB, even if you drag to the VOR, get the VOR details up, and tap the add to route button. Sounds like omitting the destination airfield until the route is entered might be a good work around, I'll try it.
Edit: Nope, it still goes to the NDB. I start at AD, tap the
TBD VOR, the window pops up with the
TBD VOR details, I tap "add to route" and it still draws the route to the NDB.