Why, when I use `m.module`, does it not automatically rerender the view?

mithril_redraw_question.js

////////app.js

define([ 'mithril', 'propertyPane'],
  function(m, propertyPane){
    //div#properties exists
    m.module(document.getElementById('properties'),propertyPane);
});

///////propertyPane.js

define([ 'mithril', 'emitter'],
  function(m, emitter) {

    //mithril "namespace"
    var propertyPane = {};

    ///////////////////////
    //    Models         //
    ///////////////////////
    propertyPane.PropertyList = Array;

    propertyPane.Property = function(name, data) {
      //the following reflects the format of the data obects as sent by the event emitter
      this.name        = m.prop(name);
      this.value       = m.prop(data.value);
      this.type        = m.prop(data.valueType);
      this.visible     = m.prop(data.userVisible);
      this.editable    = m.prop(data.userEditable);
    };

    ///////////////////////
    //    Controller     //
    ///////////////////////
    propertyPane.controller = function() {

      this.properties = propertyPane.PropertyList();
      
      this.updatePropertyPane = function(sender) {
        //destroy current list
        this.properties.length = 0;

        for( var key in sender.currentItem.tag){
          this.properties.push(new propertyPane.Property(key, sender.currentItem.tag[key]));
        }
//>>>This is required to make the property pane to rerender:<<<
//      m.redraw(); //why?
//why doesn't redraw happen automatically (because I'm using m.module)??
      }.bind(this);

      //this reliably updates the the properties list
      //but rerender does not happen
      emitter.addCurrentItemChangedListener(this.updatePropertyPane);

    };

    ///////////////////////
    //    View           //
    ///////////////////////
    propertyPane.view = function(ctrl){
      return m('ul',
        ctrl.properties.map(function(property){
          return m('li', property.name() + ' ' + property.value());
        })
      );
    };

    return propertyPane;
});