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Using beginSheet

I'm trying to create a sheet for a window but I keep getting a error "Modal session requires modal window". What am I doing wrong in the code snipplet below?

Thanks
~Hua Ying

NSWindowController *newWindow = [[NSWindowController alloc] initWithWindowNibName: @"AddGroupDialog"];

NSModalSession session = [NSApp beginModalSessionForWindow:[newWindow window]];
[NSApp runModalSession:session];
[NSApp beginSheet:[newWindow window]
modalForWindow:mainWindow
modalDelegate: self
didEndSelector: @selector(didEndAddGroupSheet)
contextInfo: NULL];

[NSApp endModalSession:session];



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