public static function init() {

		// Adds ID to top of popup editor.
		add_action( 'edit_form_top', array( __CLASS__, 'add_popup_id' ) );

		// Change title to popup name.
		add_filter( 'enter_title_here', array( __CLASS__, '_default_title' ) );

		// Add popup title field.
		add_action( 'edit_form_advanced', array( __CLASS__, 'title_meta_field' ) );

		// Add Contextual help to post_name field.
		add_action( 'edit_form_before_permalink', array( __CLASS__, 'popup_post_title_contextual_message' ) );

		// Register Metaboxes.
		add_action( 'add_meta_boxes', array( __CLASS__, 'meta_box' ) );

		// Process meta saving.
		add_action( 'save_post', array( __CLASS__, 'save' ), 10, 2 );


		// Set the slug properly on save.
		add_filter( 'wp_insert_post_data', array( __CLASS__, 'set_slug' ), 99, 2 );

		// Dashboard columns & filters.
		add_filter( 'manage_edit-popup_columns', array( __CLASS__, 'dashboard_columns' ) );
		add_action( 'manage_posts_custom_column', array( __CLASS__, 'render_columns' ), 10, 2 );
		add_filter( 'manage_edit-popup_sortable_columns', array( __CLASS__, 'sortable_columns' ) );
		add_filter( 'default_hidden_columns', array( __CLASS__, 'hide_columns' ), 10, 2 );
		add_action( 'load-edit.php', array( __CLASS__, 'load' ), 9999 );
		add_action( 'restrict_manage_posts', array( __CLASS__, 'add_popup_filters' ), 100 );
		add_filter( 'post_row_actions', array( __CLASS__, 'add_id_row_actions' ), 2, 100 );

		add_action( 'post_submitbox_misc_actions', array( __CLASS__, 'add_enabled_toggle_editor' ), 10, 1 );
	}