Draw help?

I Need help with something.
In this swep:http://www.youtube.com/watch?v=dJDieQyOGz8&list=UUHv4UkUd7MUgGUZZ66SvpZQ&index=1&feature=plcp
I want to make it so when you select another weapon, it uses a animation to put the weapon away.
I have no clue how to do this as initialize is when you pull the weapon out?
You will get credit in the final release.