title: NSStatusBar item glow without the glow image on Xcode
body: <p>How can i make something like this glow on a status bar item?
  <br><img src="https://i.stack.imgur.com/hpjiU.png" alt="enter image description here"></p>
  
  <p>I know that i can do that with another png, but i have seen some other applications where they only have the black icon of the statusbar, no glow.
  <br>How can i do that?
  <br>Thanks</p>