title: NSPopover Not Appearing
body: <p>I really wish I could be more specific, but unfortunately, I cannot. All appropriate objects are non-nil, and all appropriate method calls are going through (presumably) successfully, but my <code>NSPopover</code> just never shows up. None of the delegate methods get called, either.</p>
  
  <pre><code>// ivars
  NSPopover *tagPopover;
  NSViewController *tagPopoverViewController;
  
  // in method to display popover
  tagPopover = [[NSPopover alloc] init];
  [tagPopover setBehavior: NSPopoverBehaviorApplicationDefined];
  [tagPopover setDelegate: self];
  tagPopoverViewController = [[MYViewController alloc] initWithNibName: @"MYViewController" bundle: nil];
  [tagPopover setContentViewController: tagPopoverViewController];
  [tagPopover setContentSize: tagPopoverViewController.view.frame.size];
  
  [tagPopover showRelativeToRect: NSMakeRect(700, 400, 5, 5) // Screen coordinates
                          ofView: [[NSApp keyWindow] contentView]
                   preferredEdge: NSMinYEdge];
  </code></pre>