title: How to add dynamic select box in magento configuration file
body: <p>I want to show dynamic select box for choose value at system configuration. I have added text box as shown in images it's simple to add text box but how can I add select box same like text box.</p>
  
  <p>I have added below code to show dynamic text box:</p>
  
  <pre><code>&lt;fields&gt;
      &lt;product_option translate="label"&gt;
                              &lt;label&gt;Tour Options&lt;/label&gt;
                              &lt;backend_model&gt;adminhtml/system_config_backend_serialized_array
                              &lt;/backend_model&gt;
                              &lt;frontend_model&gt;customoptioncreater/adminhtml_system_config_form_field_additem
                              &lt;/frontend_model&gt;
                              &lt;sort_order&gt;31&lt;/sort_order&gt;
                              &lt;show_in_default&gt;1&lt;/show_in_default&gt;
                              &lt;show_in_website&gt;1&lt;/show_in_website&gt;
                              &lt;show_in_store&gt;1&lt;/show_in_store&gt;
                              &lt;comment&gt;Add Tour Options Item&lt;/comment&gt;
                          &lt;/product_option&gt;
                         &lt;/fields&gt;
  </code></pre>
  
  <p>And create model file to render html:</p>
  
  <p><img src="https://i.stack.imgur.com/v4nL9.png" alt="enter image description here"></p>
  
  <p>Any help would be much appreciated.</p>