title: Use wp_dropdown_pages in theme options
body: <p>I am using <code>wp_dropdown_pages</code> in a WordPress theme options.
  I have this code so far:</p>
  
  <pre><code>wp_dropdown_pages( array( 
      'name' =&gt; 'plugin_options[whatever_page]', 
      'show_option_none' =&gt; __( '— Select —' ), 
      'option_none_value' =&gt; '0', 
      'selected' =&gt; $options['whatever_page'] 
  ));
  </code></pre>
  
  <p>It works perfectly to show a selectbox of the pages and their <code>page_ID</code> as options' values.
  Only one trouble I am having, after selecting a page and save settings, the page is not selected.
  How can I save the selected page?</p>