Setting filter to "clear" on Paint properties erase the background. Image or solid make no differences. So you can see the standard lockscreen or your paused app below. This is bad becouse create ugly artifacts on nice lockscreen I have worked on. I also notice that if I do a gesture on lock that animate the item (like fade out or anyelse) it start to work right.
example with 3 shapes:
0. black solid backgrond
1.square
2.bottom rectangle (clear filter) to create an edge to top line
3.top rectangle
currently
should be:
