I don't know about getting the controls back but there is a work around. Put the item you want to lighten/darken into a movie. Layer the movie (not the item in question) onto a black or white layer and adjust the alpha of the movie in the properties panel. You should be able to have very precise control without too much extra trouble. I use this technique to adjust brightness on items that are integrated into an animation and cannot be color corrected in Photoshop or Illustrator.
Hope this helps,
Thanks but I need to be able to change the color for artwork so this wouldn't work for me.