[QUESTION] New command with a header runs itself?

This is my code:

`editor.Panels.addButton('devices-c', [{ 
    	id: 'go-home', 
    	className: 'fa fa-home', 
        command: 'go-home',
    	attributes: { 
    		title: 'Go home' 
    	} 
    },]);`

`editor.Commands.add('go-home', {
        run: function(em, sender) {
            sender && sender.set('active');
            <?php header('Location: ./index.php'); ?>
        }
    });`

Moreover, I'd like to know how to add the button WHERE I want and not next to the devices buttons, I didn't find any answer on this!

Thanks for reading,
Tanguy.