mirror

[highfrontier]

hi,

does anyone know if there is anything like an automatically updating mirror tool in xtreme? by automatic, I mean that when the original half of the design is changed, the mirrored side includes the changes.. can't find any option in the layers.. but is there a plugin/workaround.
The fastest way I've found so far is to select the curves to be mirrored, and scale with one of the middle handles opposite the imaginary line of mirroring, then scale with ctrl held down while moving the mouse over this line of symmetry.

The reason I need it is because I'm designing a shaped, but symmetrical bottle and want to be able to see quickly the result of tweaking the styling slightly. doing the mirroring manually each time is slowing me down.

any ideas guys?

thanks.