title: How to launch Maintenance mode--"Change, Repair, or Remove installation" dialog in WIX
body: <p>I have changed the wix tutorial codes from here <a href="http://www.tramontana.co.hu/wix/" rel="nofollow noreferrer">http://www.tramontana.co.hu/wix/</a> to make my own installer. </p>
  
  <p>There is no problem when I run the installer to setup my application. But when I run the the installer again, a window jumped out said "Another version of this prodcut is already installed..." </p>
  
  <p>But in the sample, there should be a Maintenance mode, "change, repair or remove installation" dialog when running the installer after the program has already been installed. </p>
  
  <p>I am using the WixUI_Mondo, I think it provides the maintenance mode automatically, any idea how to launch it?</p>