title: Blockly text input blur
body: <p>I have small problem about blockly.</p>
  
  <p>I need to call some event (for example <code>alert('hello world')</code> ) when someone blurs text input.</p>
  
  <p>I used <code>Blockly.addChangeListener</code>, but this function is not called when someone create blur event on text input.</p>