How do I mirror flip a layer?

I can see the option to mirror a sprite but how do I take a layer and flip the whole thing to mirror the original appearance?

I know I can change the angle of a layer but this doesn't have the desired effect.

Thanks in advance for any help.

Am I right to assume this isn't possible then?

What kind of setup do you have? Do you need just window size effect? You can always set things up manually.

Perhaps use the canvas plugin and paste the layer into it. There is a way to invert/mirror the things that are pasted on canvas but I don't quite remember how. Do a search in the forums, use the terms "Canvas", "Reflection" and I think that you will find some relative posts.

Object set x to layout width-self.x.

Thanks for the responses. I found a way around it putting all the layer objects into a family and using the action:

Set Y: Family.Y+2*(LayoutHeight/2-Family.Y)