Question

How to do it? I simply want to load a window and show it in front of the main window.

NSWindowController* controller = [[NSWindowController alloc] initWithWindowNibName: @"MyWindow"];
NSWindow* myWindow = [controller window];
[myWindow makeKeyAndOrderFront: nil];

This code shows the window for one moment and then hides it. IMHO this is because I don’t keep reference to the window (I use ARC). [NSApp runModalForWindow: myWindow]; works perfectly but I don’t need to show it modally.

Answer 1

Yes, with ARC if you don’t hold a reference to the window it will be torn down as soon you as you exit the routine you were in. You need to hold a strong reference to it in an ivar. [NSApp runModalForWindow: myWindow] is different because the NSApplication object holds a reference to the window as long as it is being run modally.