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In Views areas (header, footer, empty-text) are pluggable, this means you can write your own php logic to place whatever you want.

<h3>Requirements</h3>

You should have read <a href="topic:views/api">API</a> and <a href="topic:views/api-tables">Tables API</a> to get a basic knowledge

how to extend views.

<h3>Create your own area handler</h3>

The first step is to tell views: Hey i want to add a new area handler.

Therefore you have to implement hook_views_data and add a new one. For example:

<pre>

function yourmodule_views_data() {

  $data['views']['collapsible_area'] = array(

    'title' => t('Collabsible Text area'),

    'help' => t('Provide collabsible markup text for the area.'),

    'area' => array(

      'handler' => 'yourmodule_handler_collapsible_area_text',

    ),

  );

}

</pre>

The second step is to write this handler. Therefore create a file called yourmodule_handler_collapsible_area_text.inc and

add it to the .info file of your module.

Then add content to your area file like this:

<pre>

class yourmodule_handler_collapsible_area_text extends views_handler_area_text {

  function render($empty = FALSE) {

    // Here you just return a string of your content you want.

    if ($render = parent::render($empty)) {

      $element = array(

        '#type' => 'fieldset',

        '#title' => t('Title'),

        '#value' => $render,

      );

      $output = theme('fieldset', $element);

      return $output;

    }

  }

}

</pre>

As on every handler you can add options so you can configure the behavior. If the area isn't shown yet in the views interface, please clear the cache :)