WP_Customize_Manager::get_panel PHP Method

    public function get_panel($id)
    {
        if (isset($this->panels[$id])) {
            return $this->panels[$id];
        }
    }

	/**
	 * Render the widget form control templates into the DOM.
	 *
	 * @since 3.9.0
	 * @access public
	 */
	public function output_widget_control_templates() {
		?>
		<div id="widgets-left"><!-- compatibility with JS which looks for widget templates here -->
		<div id="available-widgets">
			<div class="customize-section-title">
				<button class="customize-section-back" tabindex="-1">
					<span class="screen-reader-text"><?php _e( 'Back' ); ?></span>
				</button>
				<h3>
					<span class="customize-action"><?php
						/* translators: &#9656; is the unicode right-pointing triangle, and %s is the section title in the Customizer */
						echo sprintf( __( 'Customizing &#9656; %s' ), esc_html( $this->manager->get_panel( 'widgets' )->title ) );
					?></span>
					<?php _e( 'Add a Widget' ); ?>
				</h3>
			</div>
			<div id="available-widgets-filter">
				<label class="screen-reader-text" for="widgets-search"><?php _e( 'Search Widgets' ); ?></label>
				<input type="search" id="widgets-search" placeholder="<?php esc_attr_e( 'Search widgets&hellip;' ) ?>" />
			</div>
			<div id="available-widgets-list">
			<?php foreach ( $this->get_available_widgets() as $available_widget ): ?>
				<div id="widget-tpl-<?php echo esc_attr( $available_widget['id'] ) ?>" data-widget-id="<?php echo esc_attr( $available_widget['id'] ) ?>" class="widget-tpl <?php echo esc_attr( $available_widget['id'] ) ?>" tabindex="0">
					<?php echo $available_widget['control_tpl']; ?>
				</div>
			<?php endforeach; ?>
			</div><!-- #available-widgets-list -->
		</div><!-- #available-widgets -->
		</div><!-- #widgets-left -->
		<?php
	}