Hi there Magento developers! 

I am trying to remove the Add New button from an Adminhtml grid in Magento 1.9.

I have found [this post](http://blog.chapagain.com.np/magento-how-to-remove-or-rename-add-new-button-from-admin-grid/) and [this other one](https://magento.stackexchange.com/questions/166711/magento-2-how-to-remove-add-new-model-button-on-magento-backend-block-widge) about doing that in Magento 2.0, but the same technique does not apply to Magento 1.9.

The error reported in Magento 1.9 is this:

    exception 'Varien_Exception' with message 'Invalid method TBF_Cupom_Block_Adminhtml_Gerados_Index_Grid::_removeButton(Array
    (
        [0] => add
    )
    )' in /var/www/html/lib/Varien/Object.php:653

In fact it makes sense because Grid's parent class is Mage_Adminhtml_Block_Widget_Grid and it does not have a _removeButton() method.

So, the question remains... How can I remove the Add New button from an Admin Grid Widget in Magento 1.9?

Thanks in advance!