I open a NSWindow from my main NSWindow.
DropHereWindowController *dropHereWindowController = [[DropHereWindowController alloc] initWithWindowNibName:@\"Drop
Method:
- (void)setLevel:(NSInteger)windowLevel
Sub-class the NSWindow:
[self setLevel: NSStatusWindowLevel];
Or simply use:
[window setLevel: NSStatusWindowLevel];
Available levels: