Add the "zOffset" parameter, which is the start offset of the z-index.

[RyutaKojima]

Summary

I want a parameter that sets the start of z-index. This is because it is displayed before other component with z-index specified.

Construction

I added a "zOffset" parameter into "WindowType".

If "zOffset" specified, the z-index of the component with the same zGroup starts at that value. If not, it works the same as before.

Thanks for reading.