Rename ‘Add New’ button

Here are the steps to rename the ‘Add New’ text to anything you required (for example, ‘Add Report’):-
– Go to YourNamespace -> YourModule -> Block -> Adminhtml -> YourFile.php
– Add the following code in the constructor of this file:-

$this->_addButtonLabel = Mage::helper('yourmodulename')->__('Add Report');

Remove ‘Add New’ button

Here are the steps to remove the ‘Add New’ button:-
– Go to YourNamespace -> YourModule -> Block -> Adminhtml -> YourFile.php
– Add the following code in the constructor of this file (it should be just below the call to parent constructor):-

parent::__construct();
$this->_removeButton('add');