title: Create a simple Wordpress plugin page with iframe?
body: <p>I am creating a plugin page for Wordpress. This plugin page contains an iframe. But a suggested php method (instead of iframe html method) of yours would be nice too.</p>
  
  <p>What is a problem is that this plugin page not responding. Because this plugin page has not created its own admin menu. What is wrong with this plugin page?</p>
  
  <p>Here is code:</p>
  
  <pre><code>&lt;?php
  /*
  Plugin Name: Leo
  Plugin URI: http://www.example.com
  Description: Blabla
  Author: Leo
  Version: 1.1
  Author URI: http://www.example.com
  
  function schedule() {
    ?&gt;
      &lt;h1&gt;schedule&lt;/h1&gt;
      &lt;a href="/wp-admin/admin.php?page=schedulesite"&gt;Show schedule&lt;/a&gt;&lt;br /&gt;
    &lt;?PHP
  }
  
  function schedulesite() {
    echo "&lt;iframe style="width:100%;height:800px;border=0;"
  src="http://www.example.com/schedule.php"&gt;&lt;/iframe&gt;";
  }
  
  
  function scheduleAddMenu() {
    add_menu_page('schedule', 'schedule', 10, __FILE__, 'schedule');
    add_submenu_page(__FILE__, 'Show schedule', 'Show schedule', 10, 'schedulesite', 'schedulesite');
  }
  ?&gt;
  </code></pre>