Obtain Javascript object from the dom element in google closure

Question

Is there a way to obtain the underlying object from dom element.

For instance.

• I have a base class which renders some buttons using goog.ui.CustomButton.
• In the child class I want to get underlying goog.ui.CustomButton object through the generated dom element.

Is it possible or do I need to cache the underlying objects:

    mylib.Base = function() {
    };

    mylib.Base.prototype.renderButtons = function(buttonTypes) {
      for(var i in buttonTypes) {
        var button = new goog.ui.CustomButton();
        var buttonContainer = goog.dom.getElement('button-container_' + buttonTypes[i]);
        button.render(buttonContainer);
      }
    };


    mylib.Child = function() {
      mylib.Base.base(this, 'constructor');
    };
    goog.inherits(mylib.Child, mylib.Base);


    mylib.Super.prototype.someTask = function() {
      this.renderButtons(['save_button','cancel_button']);
      var saveButtonHolder = goog.dom.getElement('button-container_' + 'save_button');
      var saveButtonElement = saveButtonHolder.childern[0]; // Not production code

      // Now Is it possible to get the goog.ui.CustomButton object through the
      // saveButtonElement ?
    };