/**
* Gets the XHTML representation of the element's closing tag
*
* @return string
*/
protected function GetCloseTagXhtml()
{
# add internal buttons at the last possible stage before closing the form,
# to ensure that all child controls have a chance to register their internal buttons
$s_xhtml = $this->b_render_base_element ? parent::GetCloseTagXhtml() : '';
if (count($this->a_internal_buttons)) {
$this->a_internal_buttons = array_unique($this->a_internal_buttons);
$o_internal = new TextBox($this->GetNamingPrefix() . 'InternalButtons', implode('; ', $this->a_internal_buttons));
$o_internal->SetMode(TextBoxMode::Hidden());
$s_xhtml = '<div>' . $o_internal->__toString() . '</div>' . $s_xhtml;
}
return $s_xhtml;
}