How do you make heroes fly?

Is there a way to make heroes fly instead of walk? I am trying to make a gyrocopter hero, but it doesn't appear in-game. It just has a shadow with no unit. Can this be done?

Its possible, but most people who try this run into problems when they set this up.

Nevermind, i found a post that helped me already.

Oh my God, I'm about to blow my waffle... =)