How to add new button to order view in Magento admin panel?

Question

How to add custom button to order view page near \"Back\" and \"Edit\"?

Answer 1

Instead of core hacks or rewrites, just use an observer to add the button to the order:

    
        
            
                
                    your_module/observer
                    singleton
                    adminhtmlWidgetContainerHtmlBefore
                
            
        
    

Then just check in the observer if the type of the block matches the order view:

public function adminhtmlWidgetContainerHtmlBefore($event)
{
    $block = $event->getBlock();

    if ($block instanceof Mage_Adminhtml_Block_Sales_Order_View) {
        $message = Mage::helper('your_module')->__('Are you sure you want to do this?');
        $block->addButton('do_something_crazy', array(
            'label'     => Mage::helper('your_module')->__('Export Order'),
            'onclick'   => "confirmSetLocation('{$message}', '{$block->getUrl('*/yourmodule/crazy')}')",
            'class'     => 'go'
        ));
    }
}

The "getUrl" function of the block will automatically append the current order id to the controller call.