How do you update the hidden tree shaders?

I downloaded the built-in shaders that match my unity install (4.2.2) and did a quick update to the Tree Creator Leaves Optimized shader which is being use all over my project. Unfortunately, it does not seem to be updating anything at all in my scene or in the hidden, un-editable shaders in each tree (the ones that get auto created by the tree creator).

Is there something special that I need to do to get it to work? Do I need to place the shader in a specific location so that it uses mine instead of the built-in one?

This is the shader list that I copied into my project. I modified TreeCreatorLeavesOptimized because that's the one the system seems to auto generate.