WiX: A Developer's Guide to Windows Installer XML

Subscribe element

Some events can't be published, only listened for. In that case, you'll use a Subscribe element inside a Control element. Use its Event attribute to specify the event to listen for and Attribute to set the required argument. The next example shows a ProgressBar control that subscribes to the SetProgress event. Whenever a standard or custom action notifies the installer that progress has been made, the ProgressBar will know about it and add more ticks.

<Control Id="MyProgressBar" 
         Type="ProgressBar" 
         X="50" 
         Y="50" 
         Width="200" 
         Height="20" 
         ProgressBlocks="yes">
  <Subscribe Event="SetProgress"
             Attribute="Progress" />
</Control>

Unlike the Publish element, the Subscribe element can't have a conditional statement as its inner text. A single ...