title: Use WixUIBannerBmp in my custom dialog
body: <p>In my installer I have set WixUIBannerBmp to point to my own custom <code>dialog-banner.bmp</code>.<br>
  Now I have added a custom dialog I would like to have the same banner as on the other dialogs.</p>
  
  <p>Is there a way to refer to the existing WixUIBannerBmp?</p>
  
  <p>Workaround would be to create a Binary containing the image and refer to that. But it seems like it shouldn't be needed.</p>
  
  <p>/L</p>