gistfile1.js

// base controller
define(['lazoCtl'], function (Ctl) {

  'use strict';
  
  return Ctl.extend({
  
    index: function (options) {
      this.loadModel('session', {
        success: function (model) {
          this.ctx.models.session = model;
          // the extended controller could set a property
          // enabling you to call any view from the base
          options.success(this.action || 'index');
        },
        error: function (options) {
          // handle error
        }
      });
    }
  
  });

});

// extend base controller
// you could use another controller or the lazo
// base controller; the main point is that
// you eventually call BaseCtl.prototype.index
define(['app/baseCtl'], function (BaseCtl) {

  'use strict';
  
  return BaseCtl.extend({
  
    index: function (options) {
      // execute code specific to this controller
      // then call base controller index action
      
      BaseCtl.prototype.index.call(this, options);
    }
  
  });
  
});