title: Is it possible to change the color of Wicket's activity indicator?
body: <p>Situation: I'm working with Wicket's <code>IndicatingAjaxButton</code>. I have the button set up on a page with black background. When the user pushes the button, the button's activity indicator goes off and spins until the system is ready to move on.</p>
  
  <p>Problem: Because of the black background, the indicator looks bad. Since part of the indicator is animated in black, some of the details are lost using the indicator on a black background.</p>
  
  <p>Question: Is it possible in Wicket to change the color of the <code>IndicatingX</code> [Button, Link, etc.], or do I have to design my page in a new way?</p>