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diff --git a/src/blockly/core/field_checkbox.js b/src/blockly/core/field_checkbox.js
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+/**
+ * @license
+ * Visual Blocks Editor
+ *
+ * Copyright 2012 Google Inc.
+ * https://developers.google.com/blockly/
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Checkbox field.  Checked or not checked.
+ * @author fraser@google.com (Neil Fraser)
+ */
+'use strict';
+
+goog.provide('Blockly.FieldCheckbox');
+
+goog.require('Blockly.Field');
+
+
+/**
+ * Class for a checkbox field.
+ * @param {string} state The initial state of the field ('TRUE' or 'FALSE').
+ * @param {Function=} opt_validator A function that is executed when a new
+ *     option is selected.  Its sole argument is the new checkbox state.  If
+ *     it returns a value, this becomes the new checkbox state, unless the
+ *     value is null, in which case the change is aborted.
+ * @extends {Blockly.Field}
+ * @constructor
+ */
+Blockly.FieldCheckbox = function(state, opt_validator) {
+  Blockly.FieldCheckbox.superClass_.constructor.call(this, '', opt_validator);
+  // Set the initial state.
+  this.setValue(state);
+};
+goog.inherits(Blockly.FieldCheckbox, Blockly.Field);
+
+/**
+ * Character for the checkmark.
+ */
+Blockly.FieldCheckbox.CHECK_CHAR = '\u2713';
+
+/**
+ * Mouse cursor style when over the hotspot that initiates editability.
+ */
+Blockly.FieldCheckbox.prototype.CURSOR = 'default';
+
+/**
+ * Install this checkbox on a block.
+ */
+Blockly.FieldCheckbox.prototype.init = function() {
+  if (this.fieldGroup_) {
+    // Checkbox has already been initialized once.
+    return;
+  }
+  Blockly.FieldCheckbox.superClass_.init.call(this);
+  // The checkbox doesn't use the inherited text element.
+  // Instead it uses a custom checkmark element that is either visible or not.
+  this.checkElement_ = Blockly.createSvgElement('text',
+      {'class': 'blocklyText blocklyCheckbox', 'x': -3, 'y': 14},
+      this.fieldGroup_);
+  var textNode = document.createTextNode(Blockly.FieldCheckbox.CHECK_CHAR);
+  this.checkElement_.appendChild(textNode);
+  this.checkElement_.style.display = this.state_ ? 'block' : 'none';
+};
+
+/**
+ * Return 'TRUE' if the checkbox is checked, 'FALSE' otherwise.
+ * @return {string} Current state.
+ */
+Blockly.FieldCheckbox.prototype.getValue = function() {
+  return String(this.state_).toUpperCase();
+};
+
+/**
+ * Set the checkbox to be checked if strBool is 'TRUE', unchecks otherwise.
+ * @param {string} strBool New state.
+ */
+Blockly.FieldCheckbox.prototype.setValue = function(strBool) {
+  var newState = (strBool == 'TRUE');
+  if (this.state_ !== newState) {
+    if (this.sourceBlock_ && Blockly.Events.isEnabled()) {
+      Blockly.Events.fire(new Blockly.Events.Change(
+          this.sourceBlock_, 'field', this.name, this.state_, newState));
+    }
+    this.state_ = newState;
+    if (this.checkElement_) {
+      this.checkElement_.style.display = newState ? 'block' : 'none';
+    }
+  }
+};
+
+/**
+ * Toggle the state of the checkbox.
+ * @private
+ */
+Blockly.FieldCheckbox.prototype.showEditor_ = function() {
+  var newState = !this.state_;
+  if (this.sourceBlock_) {
+    // Call any validation function, and allow it to override.
+    newState = this.callValidator(newState);
+  }
+  if (newState !== null) {
+    this.setValue(String(newState).toUpperCase());
+  }
+};