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i'm not having any luck actually accessing these callbacks. I don't know where to put the function to work. Does anyone have a working example of using these callbacks?
johnmathergot it.thanks
You should be able to define the methods inside the script editor. In the case of MEL, you must define it as a global proc. To make these persistent across startups you can place the definitions in userSetup.mel or userSetup.py.