BP_Group_Extension::setup_display_hooks()

	protected function setup_display_hooks() {

		// Bail if not a group.
		if ( ! bp_is_group() ) {
			return;
		}

		// Backward compatibility only.
		if ( ( 'public' !== $this->visibility ) && ! buddypress()->groups->current_group->user_has_access ) {
			return;
		}

		// If the user can see the nav item, we create it.
		$user_can_see_nav_item = $this->user_can_see_nav_item();

		if ( $user_can_see_nav_item ) {
			$group_permalink = bp_get_group_permalink( groups_get_current_group() );

			bp_core_create_subnav_link( array(
				'name'            => ! $this->nav_item_name ? $this->name : $this->nav_item_name,
				'slug'            => $this->slug,
				'parent_slug'     => bp_get_current_group_slug(),
				'parent_url'      => $group_permalink,
				'position'        => $this->nav_item_position,
				'item_css_id'     => 'nav-' . $this->slug,
				'screen_function' => array( &$this, '_display_hook' ),
				'user_has_access' => $user_can_see_nav_item,
				'no_access_url'   => $group_permalink,
			), 'groups' );
		}

		// If the user can visit the screen, we register it.
		$user_can_visit = $this->user_can_visit();

		if ( $user_can_visit ) {
			$group_permalink = bp_get_group_permalink( groups_get_current_group() );

			bp_core_register_subnav_screen_function( array(
				'slug'            => $this->slug,
				'parent_slug'     => bp_get_current_group_slug(),
				'screen_function' => array( &$this, '_display_hook' ),
				'user_has_access' => $user_can_visit,
				'no_access_url'   => $group_permalink,
			), 'groups' );

			// When we are viewing the extension display page, set the title and options title.
			if ( bp_is_current_action( $this->slug ) ) {
				add_filter( 'bp_group_user_has_access',   array( $this, 'group_access_protection' ), 10, 2 );

				$extension_name = $this->name;
				add_action( 'bp_template_content_header', function() use ( $extension_name ) {
					echo esc_attr( $extension_name );
				} );
				add_action( 'bp_template_title', function() use ( $extension_name ) {
					echo esc_attr( $extension_name );
				} );
			}
		}

		// Hook the group home widget.
		if ( bp_is_group_home() ) {
			add_action( $this->display_hook, array( &$this, 'widget_display' ) );
		}
	}