From Jeremie Leroy - XOJO Controls Wiki
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PropertyListBox.LoadingValueList ( ValueName As String ) As String()

The list of AutoComplete or ContextualMenu items need to be loaded. This enables having dynamic lists depending on the contents of the PropertyListBox or any other parameter from your App. Return an Array of Strings. In older versions of REALbasic (prior to 2009), the PropertyListBox might crash if you do not return an empty array instead of returning Nil.