protected virtual bool OnDuplicateArgumentWarning(
	CommandLineArgument argument,
	string? newValue
)Protected Overridable Function OnDuplicateArgumentWarning ( 
	argument As CommandLineArgument,
	newValue As String
) As Boolean
Dim argument As CommandLineArgument
Dim newValue As String
Dim returnValue As Boolean
returnValue = Me.OnDuplicateArgumentWarning(argument, 
	newValue)protected:
virtual bool OnDuplicateArgumentWarning(
	CommandLineArgument^ argument, 
	String^ newValue
)The base class implementation writes a warning to the ParseOptionsError writer.
This method will not be called if the nested subcommand uses the ICommandWithCustomParsing interface.