Ok when you search your gridviews the css that you set up on the column is ignored.
If I have something like what is below in my view when I use the filter to search on any of the columns the ‘class’=>‘gridDate’ is ignored. What defines the css of the grid after you search?
'columns' => array(
array(
'filter' => CHtml::activeTextField($model, 'DateCreated'),
'value' => '$data->DateCreated',
'htmlOptions'=> array('class'=>'gridDate'),
),