title: How to flash a custom NSMenuItem view after selection?
body: <p>I need to assign a view to an NSMenuItem and do some custom drawing. Basically, I'm adding a little delete button next to the currently selected menu item, among other things. But I want my custom menu item to look and behave like a regular menu item in all other ways. According to the doc:</p>
  
  <blockquote>
    <p>A menu item with a view does not draw
    its title, state, font, or other
    standard drawing attributes, and
    assigns drawing responsibility
    entirely to the view.</p>
  </blockquote>
  
  <p>Ok, so I had to duplicate the look of the state column and the selection gradient, which wasn't that hard. The part I'm having trouble with is the way the menu item "flashes" or "blinks" after it is selected. I'm using an NSTimer to try to mimic this little animation, but it just feels off. How many times does it blink? What time interval should I use? I've experimented a lot and it just feels out of whack.</p>
  
  <p>Has anyone done this before or have other suggestions on how to add a button to a menu item? Maybe there should be a stack exchange site just for custom cocoa drawing...</p>