Demonstrates how to add page meta box specific to in-page tabs with Admin Page Framework. This is a sample plugin introduced in the tutorial Add a Page Meta Box Specific to an In-page Tab (http://en.michaeluno.jp/admin-page-framework/tutorials-v3/10-add-a-page-meta-box-specific-to-an-in-page-tab/).

tutorials-10-add -a-page-meta-box-to-an in-page-tab.php

<?php
/*
 *  Plugin Name:    Admin Page Framework Tutorial 10 - Add a Page Meta Box Specific to an In-page Tab
 *  Plugin URI:     http://en.michaeluno.jp/admin-page-framework
 *  Description:    Adds a page meta box specific to in-page tab.
 *  Author:         Michael Uno
 *  Author URI:     http://michaeluno.jp
 *  Version:        1.0.1
 *  Requirements:   PHP 5.2.4 or above, WordPress 3.4 or above. Admin Page Framework 3.0.6 or above
 */

// Include the library file. Set your file path here.
include( dirname( dirname( __FILE__ ) ) . '/admin-page-framework/apf/admin-page-framework.php' );

class APF_Tutorial_NormalPageMetaBox extends AdminPageFramework_PageMetaBox {
        
    /*
     * Use the setUp() method to define settings of this meta box.
     */
    public function setUp() {
    
        /**
         * Adds setting fields in the meta box.
         */
        $this->addSettingFields(
            array(
                'field_id'          => 'tutorial_normal_page_metabox_select',
                'type'              => 'select',
                'title'             => __( 'Select', 'admin-page-framework-tutorial' ),
                'label'             => array(
                    'a' => __( 'Apple', 'admin-page-framework-tutorial' ),
                    'b' => __( 'Banana', 'admin-page-framework-tutorial' ),
                    'c' => __( 'Cherry', 'admin-page-framework-tutorial' ),
                ),
                'is_multiple'       => true,
                'attributes'        => array(
                    'size'  => 5,
                ),
            ),        
            array(
                'field_id'          => 'tutorial_normal_page_metabox_textarea',
                'type'              => 'textarea',
                'title'             => __( 'Text Area', 'admin-page-framework-tutorial' ),
                'repeatable'        => true,
            )
        );     
      
    }
   
}

new APF_Tutorial_NormalPageMetaBox(
    null,                                           // meta box id - passing null will make it auto generate
    __( 'Normal Page Meta Box', 'admin-page-framework-tutorial' ), // title
    array( 'my_tabs' =>  array( 'my_tab_b' ) ),
    'normal',                                         // context
    'default'                                       // priority
);