title: Adding a new custom field/column to the content admin
body: <p>I've been able to add an element to the bottom of the table. Although I am unsure how you ADD a coloumn into the body of the table?</p>
  
  <pre><code>function seven_form_alter(&amp;$form, &amp;$form_state, $form_id) {
          drupal_set_message("Form ID is : " . $form_id);
  
          //get node_admin_content
          //$nodeAdmin = drupal_get_form("node_admin_content");
  
  
            // Add a checkbox to registration form about agreeing to terms of use.
    $form['node_admin_content']['poland'] = array(
      '#type' =&gt; 'checkbox', 
      '#title' =&gt; t("I agree with the website's terms and conditions."), 
      '#required' =&gt; TRUE,
    );
  
  }
  </code></pre>