Thanks, and understood. However, what I'm trying to do is to enable "Lock Screen" AND be able to make vertical position adjustments to the screen. I like having a locked screen when watching 2d movies, but I'm finding the position of the screen causes me to look up and not straight ahead (ie. centered above my neutral line of sight). It would be nice to unlock the tilt slider and give people the option of positioning the locked screen up or down so as to better suit their comfort.