How to change button in Magento admin panel after sending order email?

Question

Magento

Task:
There is a Send Email button in order.
You need to change the text and style. Made

if ($this->_isAllowedAction('emails') && !$order->isCanceled()) {
            $message = Mage::helper('sales')->__('Can you confirm that you would like to send a Follow-Up email?');
            $this->addButton('send_notification', array(
                'label'     => Mage::helper('sales')->__('Send Follow-up Email'),
                'onclick'   => "confirmSetLocation('{$message}', '{$this->getEmailUrl()}')",
                'class'     => "yellow",
            ));
        }

When sending the first letter, you need to replace the text and class with new ones, after the second letter is sent, change the text and make the button inactive.
How can this problem be solved?