Disable sort/filter for existing grid column

Question

Is it possible to disable filterable/sortable for an existing grid column via observer or layout update?

Answer 1

You can achieve using _prepareColumns() method,

$this->addColumn('Your column', array(
  'header'    => Mage::helper('module')->__('Object'),
  'index'     => 'item',
  'filter'    => false,
  'sortable'  => false
));