If it is possible you use onchange and RedirectWarning

UPDATE:

     @api.onchange('my_field')
     def do_my_field(self):
            if self.my_field == "FOO":
               model, action_id = self.pool['ir.model.data'].get_object_reference(cr, uid, 'my_module', 'my_action')
               msg = _("FOO FOO FOO.")
               raise openerp.exceptions.RedirectWarning(msg, action_id, _('Go to MY ACTION'))