code: function(textField) {
              this.isTextArea = (this.textField.inputEl.dom.type.toLowerCase() == 'textarea');
  
              this.createClearButtonEl();
              this.addListeners();
  
              this.repositionClearButton();
              this.updateClearButtonVisibility();
  
              this.addEscListener();
          }
docs: After the field has been rendered sets up the plugin (create the Element for the clear button, attach listeners).
  @private