Cannot set pickListDefaults on a SelectItem

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Check with this code:

isc.DynamicForm.create({
    ID: "comboForm",
    width: 500,
    numCols: 4,

...

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Thanks for looking into this. I used bodyBackgroundColor for my example because it is visible in online showcase, just enough to show the issue.
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I am trying to create a SelectItem subclass with some customized pickList properties. According to documentation pickList is an AutoChild so something...