title: NSButton Momentary Change On Trackpad Tap
body: <p>I have a button in UI Builder of type NSButtonTypeMomentaryChange.</p>
  <p>The button is transparent, with an alternate image which displays when the button is clicked, or trackpad is pressed over the button.</p>
  <p>But when using a soft &quot;Tap&quot; on the trackpad, while the buttonpressed: event is triggered, the momentary change alternate image is not displayed.</p>
  <p>How can I configure ViewController to display and perform the momentary change action for taps on trackpad?</p>