public function removeAt($index) {
		
		if($this->_ReadOnly){
			throw new \RuntimeException(\get_called_class() . ' is read only');
		}
		
		if(!$this->offsetExists($index)){
			throw new \OutOfRangeException('$index is invalid');
		}
		
		\array_splice($this->_Arr, $index, 1);
		
		return $this;
		
	}