How I can to hide actors of first player from second player?

I make game for 2 players. I need example of code to hide actors of first player from second player. But first player must see its. help, please.

Use the show/hide sprite in Actor -> Draw.

Thanks!

How do I hide a group of actors, lets say the clicked button and a separate dialog window?

Put them in a group of their own and use:
For each member of group YourGroup
Hide sprite for member of group

Or kill them if you don´t want them hidden.