Integrate updated_at

[MageDev-1]

Hi, it would be nice if you integrate updated_at into enhancedgrid.
Show.php -> $cols[] = array('value' => 'updated_at', 'label' => 'Date Updated');
and
Columns.php ->
'updated_at' => array(
'type' => 'datetime',
'width' => '100px',
'header' => Mage::helper('catalog')->__('Date Updated'),
),

Thanks!