title: How to set or change button background color on IBAction
body: <p>I try to set the background color of a button, but, isn't work. Some can helpme please?</p>
  
  <pre><code>- (IBAction)OrBoton:(id)sender {
       [sender setBackgroundColor:(NSColor *)redColor];     
  }
  </code></pre>
  
  <p>But, if I try to setTitle, this works fine. 
  Is unacessible the Backgroundcolor property?
  I don't recived any error when I Build and Debug, but don't works.</p>
  
  <p>Thanks!</p>