01 Window weather strip

I noticed that the black rubber weather strip on the driver's door, has come loose. It's the piece on the outside of the window running horizontally on the bottom of the window opening (you'd be resting your arm on it w/the window down). I pushed down on it but, it still comes loose. I must say though; I was kind of amused that something as simple as this was coming apart.

How do I reattach this piece (glue, crimp)?