Opens a modal picture taker dialog.
Original signature is '- (NSInteger)runModal'
Available in Mac OS X v10.5 and later.
Returns NSOKButton if the user edits or chooses an image; NSCancelButton if the user cancels or does not change the default image.
- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)