protected virtual void OnChildCommandNotFound(
	string? commandName,
	CommandManager manager
)Protected Overridable Sub OnChildCommandNotFound ( 
	commandName As String,
	manager As CommandManager
)
Dim commandName As String
Dim manager As CommandManager
Me.OnChildCommandNotFound(commandName, 
	manager)protected:
virtual void OnChildCommandNotFound(
	String^ commandName, 
	CommandManager^ manager
)The base class implementation writes usage help with a list of all nested subcommands.