C4 side window re-install?

[dsentel]

My passenger side window has become loose in the operating channel that it sits in. I removed the glass completely, most all of the door trim, then reinstalled the glass in the horizontal rubber boot and channel that it sits in. I thought that I had it repaired, but when I operated the window a few times it came loose again. Does anyone know what the procedure is to get the glass fully into the boot, and what type of adhesive or sealant is recommended to keep it from coming out again. Thanks for the help.