public function offsetSet( $offset, $value ) {
		switch ( $offset ) {
			case 'is_variation':
				$this->set_variation( $value );
				break;
			case 'is_visible':
				$this->set_visible( $value );
				break;
			case 'value':
				$this->set_options( $value );
				break;
			default:
				if ( is_callable( array( $this, "set_$offset" ) ) ) {
					return $this->{"set_$offset"}( $value );
				}
				break;
		}
	}