How to enable and disable Grid Actions in Admin side

How to enable and disable Grid Actions in Admin side

To enable or Disable admin side grid Contron see the below image

or

   Follow this
app- design- adminhtml-default-default-template -widget-

comment the foolowing coding in grid.phtml

<?php if($this->getMassactionBlock()->isAvailable()): ?>
<?php echo $this->getMassactionBlockHtml() ?>
<?php endif ?>


or
Goto-app- design- adminhtml-default-default-template -widget-grid-massaction.phtml change and check with default codings

or
app- code-core-mage- adminhtml-block-widget-Grid.php changes and check with default codings