Where do you go to download the source code for Scratch?
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Important note: The Scratch source code is intended only for technically-advanced users who want to experiment with developing new features. To understand and modify the source code, you need expertise in the programming language Squeak (Smalltalk-80).

See this thread
This thread has a good discussion about which language to go to after learning scratch.

I just uploaded a little intro tutorial on how to use the Scratch Source Code to create your own new command blocks:

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