Handles key down events that do not map to an action method.
Original signature is '- (BOOL)inputText:(NSString*)string client:(id)sender'
Available in Mac OS X v10.5 and later.


YES if the input is accepted; otherwise NO.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)