I want to combine parallax and opacity effects in entering and leaving a page.
I followed the parallax sample and simply added a opacity change to one of the objects like this (original sample):
What animations are played, and in what direction, can be a little confusing at first. Please read carefully this part on custom transitions to get a better idea.
The solution in your particular case is to use DeactivatingAnimation, which gets played both forward and back on all pages that enter or leave the screen, like so: