Asks the delegate if the specified drawer should open.
Original signature is '- (BOOL)drawerShouldOpen:(NSDrawer *)sender'
Available in Mac OS X v10.0 and later.


- sender (NSDrawer)
- The drawer requesting permission to open.

YES if the drawer should open; NO to prevent the drawer from opening.

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