How to override button in Magento grid?

Question

PHP

Ust Gridin the admin panel, which looks like this:

How can I remove the button "Create New Item"?? Or appoint another for her action?
Grid container constructor:

protected function _construct()
    {
        $helper = Mage::helper('brain_custommenu');
        $this->_blockGroup = 'brain_custommenu';
        $this->_controller = 'adminhtml_categorylist';

        $this->_headerText = $helper->__('Category List');
        $this->_addButtonLabel = $helper->__('Create New Item');


        parent::_construct();
    }

Tried to do so , but the button is not removed!
Need a hint:

1. How to remove this button?
   
2. How can I assign her another one action?
   

Answer 1

По ссылке конкретный модуль. Нужно переопределить блок который вам нужно и написать код который вы нашли по ссылке

Answer 2

Идите ко мне в падованы, научу :)