Allows to configure the Administration Area order pages before they are displayed.
In the event handler you can update the back-end controller properties, for example add a filter to the orders list.
public function subscribeEvents()
{
Backend::$events->addEvent('shop:onConfigureOrdersPage', $this, 'add_orders_filter');
}
public function add_orders_filter($controller)
{
$controller->filter_filters['billing_state'] = array(
'name'=>'Billing state',
'class_name'=>'Shop_BillingStateFilter',
'prompt'=>'Please choose billing states you want to include to the list. Orders with other billing states will be hidden.',
'added_list_title'=>'Added Billing States'
);
}
