The CmdUndefined event:
Fires:
radio_button_unchecked
When an undefined user-command is called.
Notes:
radio_button_unchecked
This event is useful for lazily defining a command.
radio_button_unchecked
The pattern is matched against the command name.
radio_button_unchecked
Both <amatch> and <afile> expand to the command name.
radio_button_unchecked
Autocompletion won't work until the command is defined.
radio_button_unchecked
Alternatively, define the user-command and have it invoke an autoloaded function.