title: Combo box that displays a list of options that is wider than the control
body: <p>Using Swift 3x, I am trying to create a Cocoa app with a combo box for the user to select an SIC (Standard Industrial Classification). The list of options contains the numeric code and a description. A selected option will just display the numeric code in the combo box and the description is in a text field next to it, as shown in the following picture:</p>
  
  <p><a href="https://i.stack.imgur.com/0rL5v.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0rL5v.png" alt="enter image description here"></a></p>
  
  <p>After an SIC has been picked</p>
  
  <p><a href="https://i.stack.imgur.com/HMUVz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HMUVz.png" alt="enter image description here"></a></p>
  
  <p>In Xcode 8x, the combo box width is the same width as the list of options. How can the list of options be wider than the control? </p>
  
  <p>Thanks for your help.</p>