title: Using blur on Textfield in extjs causes error
body: <p>I am new to extjs. I am using extjs-4.1.0, I have a textfield and I wish to call trim method on its blur event. My code works fine on mozilla firefox, but causes javascript error, "Object doesn't support this property or method" on IE when the textbox loses focus.<br>
  Is there any other way to deal with blur event in IE?  </p>
  
  <p>Find my code below:  </p>
  
  <pre><code>{
          flex:1,
          xtype:'textfield',
          fieldLabel: 'Name',
          allowBlank: false,
          maxLength: 50,
          name: 'name',
          maskRe: /[a-zA-Z\s]+$/,
          validator: function(v) {
              if(!(/[a-zA-Z\s]+$/.test(v))){
                  return "This Field should be in alphabets";
              }
              return true;
          },
          listeners: {
               render: function(c) {
                  Ext.QuickTips.register({
                  target: c.getEl(),
                  text: 'Format: John/John Kelvin'
                  })  
              },
              blur: function(d) {
                  var newVal = d.getValue().trim();
                  d.setValue(newVal);
  
              }
          }
      }
  </code></pre>