moving event intialization from mxml application declaration to .as file

Question

The question says it all basically, but an example:

<?xml version="1.0" encoding="UTF-8"?>
<mx:Application 
  xmlns:mx="http://www.adobe.com/2006/mxml"  
  xmlns:mc="my_components.*" 
  xmlns:custom="swf_address.*" 
  ...
  deactivate="repeat_end(event); bActive = false"
  ...
  initialize="{new Rad_XF(this)}"
>

What would the syntax be if deactivate="repeat_end(event); bActive = false"; is moved to an .AS file - specifically if its moved to the constructor of this new class I created Rad_XF.as. The reason it has to be moved is that repeat_end and bActive are members of this new class now, and no longer defined in the mxml file. (You can see I'm passing in the application reference to the Rad_XF constructor. - this hasn't been tested yet.)