TListItemCollection maintains a list of {@link TListItem} for {@link TListControl}.
Since: 3.0
Author: Qiang Xue (qiang.xue@gmail.com)
Inheritance: extends TList
 /**
  * Removes an item from at specified index.
  * @param int zero based index.
  */
 public function removeAt($index)
 {
     parent::removeAt($index);
     if ($this->canUpdateClientSide()) {
         $this->_hasChanged = true;
     }
 }