public function get_property( $key ) {
		return isset( $this->properties[ $key ] ) ? $this->properties[ $key ] : null;
	}
public function get_property( $key ) {
		return isset( $this->properties[ $key ] ) ? $this->properties[ $key ] : null;
	}
public function get_property ( $ key ) { return isset ( $ this -> properties [ $ key ] ) ? $ this -> properties [ $ key ] : null ; }
Get box property.

@param  string $key

@return mixed
Get box property .