public function navigation() {
		$output = null;

		if ( $this->child_count() > 1 ) {

			$output .= '<ul class="uix-' . esc_attr( $this->type ) . '-tabs uix-panel-tabs">';
			$active = 'true';
			foreach ( $this->child as $child ) {
				if ( $this->is_section_object( $child ) ) {
					$output .= $this->tab_label( $child, $active );
					$active = 'false';
				}
			}
			$output .= '</ul>';
		}

		return $output;
	}