Subscribing to control events

Some events can't be published, only listened for. In that case, you'll use a Subscribe element inside a Control element. Like we did when publishing an event, use its Event attribute to specify the event to listen for, but this time use 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 control 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 control can, however, subscribe to more than one event. One example is to subscribe...