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Allow None item to be selected in OptionBox #205
If you delete an optionBox item, appear will try to select the first item - if it is a disabled item, the same error message will be displayed:
This feature is a re-enforcement of the default tkinter functionality - when you call
However, this is a necessary feature, so if the user chooses to override this functionality, we will need to reenable the menu item, select it, then disable it again.