I was playing around with the buttons on a 1987 500SEC today and I could not figure out how to get the sunroof to tilt up. What was I doing wrong?

Also, when opening the sunroof it stopped about 3/4 of the way through, leaving about 5-6 inches of the sunroof exposed that did not slide back. Is this normal or should it open all the way?

Thank you in advance!!

JR