This is the EditableColumn widget from Vitaliy Potapov.

Using this widget you can make editable one column of CGridView.

Let's pretend we have a table of the various regions from all over the world, and we want to be able to rename any of them.

$this->widget(
    'booster.widgets.TbGridView',
    array(
        'type' => 'striped bordered',
        'dataProvider' => new CActiveDataProvider('Region'),
        'columns' => array(
            'country_code',
            array(
                'class' => 'booster.widgets.TbEditableColumn',
                'name' => 'name',
                'sortable' => false,
                'editable' => array(
                    'url' => $this->owner->createUrl('example/editable'),
                    'placement' => 'right',
                    'inputclass' => 'span3'
                )
            )
        ),
    )
);

There's only one specific property:

You can look at the other options at the Yii documentation for CDataColumn.