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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?

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.

johnmather
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.

got it.thanks