The FuncUndefined event:
Fires:
radio_button_unchecked
When an undefined user-command is called.
Notes:
radio_button_unchecked
Useful for defining a function only when it's used.
radio_button_unchecked
The pattern is matched against the function name.
radio_button_unchecked
Both <amatch> and <afile> are set to the name of the function.