When VideoPlayer1.Completed Block

I am trying to have the video player to become visible.false after the video is played. I couldn't obtain that from the VideoPlayer1.Completed block.
As an alternative l had to put the videoplayer inside a Horizontal arrangement (horiz_video) and use the block when screen1.BackPressed. That alternative worked.
However , I would still like to try to use the VideoPlayer1.Completed block. Any ideas? Tks.