/**
* Adds single-line text input control used for sensitive input such as passwords.
* @param string control name
* @param string label
* @param int width of the control
* @param int maximum number of characters the user may enter
* @return TextInput
*/
public function addPassword($name, $label = NULL, $cols = NULL, $maxLength = NULL)
{
$control = new TextInput($label, $cols, $maxLength);
$control->setType('password');
return $this[$name] = $control;
}