protected function hasChange()
	{
		return !( $this->bound1() == $this->model->getRight() || $this->bound1() == $this->model->getLeft() );
	}
protected function hasChange()
	{
		return !( $this->bound1() == $this->model->getRight() || $this->bound1() == $this->model->getLeft() );
	}
protected function hasChange ( ) { return ! ( $ this -> bound1 ( ) == $ this -> model -> getRight ( ) || $ this -> bound1 ( ) == $ this -> model -> getLeft ( ) ) ; }
Check wether there should be changes in the downward tree structure.

@return boolean
Check wether there should be changes in the downward tree structure .