/**
* This is called after finishing all processing in order to return
* the output to the browser
*/
protected final function _display()
{
/**
* If there is a layout available, it will call _render(),
* so we only need to call display on the layout and
* print its output.
*/
if ($this->layout && $this->view->useLayout()) {
echo $this->layout->_display($this);
} else {
echo parent::_render();
}
}