public function createWidgetInvoicesConfigForm()
{
$form = new Am_Form_Admin();
$form->addInteger('num')->setLabel(___('Number of Invoices to display'))->setValue(5);
$form->addMagicselect('statuses')->setLabel(___('Show invoices with selected statuses') . "\n" . ___('leave it empty in case if you want to show all invoices'))->loadOptions(Invoice::$statusText);
return $form;
}