Using a different controller to perform validation than the one creating the form

[eluser]johnwbaxter[/eluser]
I've got a form that is created by a controller. The form submits to a different controller that does some stuff if the form content is valid.

My problem is that if the validation fails, i want to go back to the form creating controller and populate the view with the error message. redirect() does not work for this.

Has anyone got any ideas on how i could do this?

Thanks!