For NSOpenPanel delegates, asks the delegate whether the specified URL should be enabled in the panel. This method is not called for NSSavePanel delegates; all URLs are always disabled.
Original signature is '- (BOOL)panel:(id)sender shouldEnableURL:(NSURL *)url'
Available in Mac OS X v10.6 and later.
- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later)