[#242 state:needs_tests owner:shawn] Custom Intervention should not revert to a noncustom intervention after validation.  Back button is not a concern, bookmarks would go to the url and start a new custom intervention, or fail for lack of student selection, and the flash is in the cookie.]
[#242 state:needs_tests owner:shawn] Custom Intervention should not revert to a noncustom intervention after validation.  Back button is not a concern, bookmarks would go to the url and start a new custom intervention, or fail for lack of student selection, and the flash is in the cookie.]

vegantech/sims,vegantech/sims,vegantech/sims,vegantech/sims