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If you look at the source code you can see where you specify the theme customizer Id:

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Note: Do not change UF_OEXEC. You will lose you changes when you upgrade or reinstall. Make your own copy.

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Your redefined method Customize receives an array collection named #Themes of VF_SY170O theme objects:

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Each VF_SY170O object in the collection has many properties. For example each has a symbolic name and a description.

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Select a VF_SY170O reference in your code:  

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Then use F2 and look at the properties listed Details tab:

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