Magento, Extending Order Grid using XML markup method, select options issue - magento

Question

I am looking for some an example of how to populate a select option header in Magento order grid. The following is creating the new column rendering the data and outputting a select menu in the column header. The issue is the options are not being created in the select menu.
<layout>
<!-- main layout definition that adds the column -->
<add_order_grid_column_handle>
<reference name="sales_order.grid">
<action method="addColumnAfter">
<columnId>customer_country_id</columnId>
<arguments module="ordermanager" translate="header">
<header>Shipping Country</header>
<index>customer_country_id</index>
<type>options</type>
<sortable>true</sortable>
<options>Flipmedia_AddShippingCountryColumn_Adminhtml_Block_Widget_Grid_Column_Renderer_Country</options>
<renderer>Flipmedia_AddShippingCountryColumn_Adminhtml_Block_Widget_Grid_Column_Renderer_Country</renderer>
</arguments>
<after>status</after>
</action>
</reference>
</add_order_grid_column_handle>
<!-- order grid action -->
<adminhtml_sales_order_grid>
<!-- apply the layout handle defined above -->
<update handle="add_order_grid_column_handle" />
</adminhtml_sales_order_grid>
<!-- order grid view action -->
<adminhtml_sales_order_index>
<!-- apply the layout handle defined above -->
<update handle="add_order_grid_column_handle" />
</adminhtml_sales_order_index>
</layout>
class Flipmedia_AddShippingCountryColumn_Adminhtml_Block_Widget_Grid_Column_Renderer_Country extends Mage_Adminhtml_Block_Widget_Grid_Column_Renderer_Abstract {
private static $_countryList = array();
public function options(Varien_Object $row) {
if (count(self::$_countryList) == 0) {
$countries = Mage::getResourceModel('directory/country_collection')
->loadData()
->toOptionArray(false);
foreach ($countries as $country) {
self::$_countryList[$country['value']] = $country['label'];
}
}
return self::$_countryList;
}
public function render(Varien_Object $row){
$value = $this->_getValue($row);
$_countryList = $this->options();
return isset($_countryList[$value]) ? $_countryList[$value] : false;
}
}

Answer 1

I believe the issue is with your <options> element, if you override the sales order grid by rewriting it, you have to specify a static function for the options. I've had a look around and it looks like you need to change the way you invoke this.
Instead of using the <options> element, can you try a <filter> element like
<filter>Flipmedia_AddShippingCountryColumn_Adminhtml_Block_Widget_Grid_Column_Filter_Country</filter>
Note the new class, it should extend Mage_Adminhtml_Block_Widget_Grid_Column_Filter_Select like this...check out the magento svn as a reference.
class Mage_Adminhtml_Block_Catalog_Product_Edit_Tab_Super_Config_Grid_Filter_Inventory extends Mage_Adminhtml_Block_Widget_Grid_Column_Filter_Select
{
protected function _getOptions()
{
// return an array of options
return array(
array(
'value' => '',
'label' => ''
));
}
}