public function init ()
		{
			$class = $this->_modelClass;

			$this->_root = $class::find()->roots()->one();
			if ($this->_root == null)
			{
				$root = new $class([ 'guid' => 'root', 'title' => 'ROOT' ]);
				$root->makeRoot();

				$this->_root = $class::find()->roots()->one();
				$this->_data = [];
			}
			else
				$this->_data = $this->_root->children()->all();

			$this->buildPaths();
		}