What are values for ThisDisplay.Symbols.Item(1).Name andThisDisplay.Symbols.Item(1).Type? Are you sure Symbols.Item(1) is pointing to the correct symbol? You need first to set up the multi-state symbol before calling this function.
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I found out that every Symbol has a property called IsMultiState. Make sure it is set to True, before calling the GetMultiState method!
Can you check the value of IsMultiState property?