app.js

var c = require('window_view_controller').createController();

window_view.xml

<!--
  Alloy compiler converts this to a module named "window_view".
-->
<Alloy>
  <Window title="My Window">
    <Label id="title"/>
    <Label id="subtitle" onClick="subtitle_click"/>
  </Window>
</Alloy>

window_view_controller.js

// custom controller creation function
exports.createController = function() {
  // pull in a view by filename
  var view = require('window_view')(this);
  
  view.subtitle_click = function(e) {
    // implement click event handler
  };

  view.label1.text = 'This is a title';
  view.label2.color = 'red';
  
  view.open();
};