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about memory

In using NSOpenPanel, do we need to call alloc and dealloc?
e.g

NSOpenPanel *panel = [[NSOpenPanel alloc] init]
panel = [NSOpenPanel openPanel];
....
[NSOpenPanel dealloc]

or just

NSOpenPanel *panel = [NSOpenPanel openPanel];
......

Thank you very much ( as my concept on cocoa memory management is not so good
)

Mr Chong
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