text:         /**
           * Transition in transitionend event handler. 
           *
           * @param {Event}		TransitionEnd event object.
           * @param {Object}		The dilog instance.
           *
           * @return {undefined}
           */
          function handleTransitionInEvent(event, instance) {
              // clear the timer
              clearTimeout(instance.__internal.timerIn);
  
              // once transition is complete, set focus
              setFocus(instance);
  
              // allow handling key up after transition ended.
              cancelKeyup = false;
  
              // allow custom `onfocus` method
              dispatchEvent('onfocus', instance);
  
              // unbind the event
              off(instance.elements.dialog, transition.type, instance.__internal.transitionInHandler);
  
              removeClass(instance.elements.root, classes.animationIn);
          }
  
          /**
           * Transition out transitionend event handler. 
           *
           * @param {Event}		TransitionEnd event object.
           * @param {Object}		The dilog instance.
           *
           * @return {undefined}
           */
          function handleTransitionOutEvent(event, instance) {
              // clear the timer
              clearTimeout(instance.__internal.timerOut);
              // unbind the event
              off(instance.elements.dialog, transition.type, instance.__internal.transitionOutHandler);
  
              // reset move updates
              resetMove(instance);
              // reset resize updates
              resetResize(instance);
  
              // restore if maximized
              if (instance.isMaximized() && !instance.get('startMaximized')) {
                  restore(instance);
              }
  
              //destory the instance
              if (typeof instance.__internal.destroy === 'function') {
                  instance.__internal.destroy.apply(instance);
              }
          }