title: Indeterminate NSProgressIndicator will not animate
body: <p>So I've got a simple UI, A Start button, some text/labels, and a progress bar. When the Start button is click, the NSProgressIndicator <strong>should</strong> animate. Here's my code:</p>
  
  <pre><code>@synthesize progressBar = progressBar;
   /* Some code and setup stuffs... */
  - (IBAction)startAction:(id)sender {
      NSLog(@"Button clicked.");
      NSLog(@"Beginning Socketry and socket creation...");
      [progressBar setUsesThreadedAnimation:YES];
      [progressBar setIndeterminate:YES];
      [progressBar startAnimation:progressBar];
  }
  </code></pre>
  
  <p>I've checked multiple source (Apple Developer Portal, etc.), and nothing works. I don't have to have the NSPIndicator, but it would be really nice if I could.
  Also, here's my AppDelegate.h file:</p>
  
  <pre><code>#import &lt;Cocoa/Cocoa.h&gt;
  
  @interface AppDelegate : NSObject &lt;NSApplicationDelegate&gt;
  
  @property (assign) IBOutlet NSWindow *window;
  
  @property (readonly, strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;
  @property (readonly, strong, nonatomic) NSManagedObjectModel *managedObjectModel;
  @property (readonly, strong, nonatomic) NSManagedObjectContext *managedObjectContext;
  @property (weak) IBOutlet NSProgressIndicator *progressBar;
  - (IBAction)saveAction:(id)sender;
  
  - (IBAction)startAction:(id)sender;
  
  - (IBAction)changeStatus:(id)sender;
  
  - (IBAction)changeProgress:(id)sender;
  
  @end
  </code></pre>