title: Call custom action in WIX on change of value in Combox
body: <p>Am stuck with combo box and custom action in WIX installer.</p>
  
  <p>I have a combo box(drop down) containing few values. I want to show some text on the screen (unique for each item in dropdown) when the user selects a value from this drop down.</p>
  
  <p>In .Net we can do this easily as we have different events pre-defined. But in WIX I don't see any such event.</p>
  
  <p>Has someone faced the same problem? Or can guide me on how can I get it done.</p>