public function display_rows() {
		$style = '';
		foreach ( $this->items as $userid => $signup_object ) {

			// Avoid a notice error appearing since 4.3.0.
			if ( isset( $signup_object->id ) ) {
				$signup_object->ID = $signup_object->id;
			}

			$style = ( ' class="alternate"' == $style ) ? '' : ' class="alternate"';
			echo "\n\t" . $this->single_row( $signup_object, $style );
		}
	}