When use wid option, how to set zIndex?

[wanglunhui2012]

Describe the problem
When I develop a media player by using mpv on windows, I use javafx, the image is render successfully, But when I draw a Button on window, it show under the video. Is there any way to set the video image zIndex?

To Reproduce
By JavaFX example.

Steps to reproduce the behavior:

1. Run JavaFX example.

Expected behavior
My custom UI display over video.

Additional context
Add any other context about the problem here.

1. mpv v0.37.0-152-gbd5d8e41 (2024/1/11)
2. Windows10