Help with window.removeEvent

[marlun78]

Hey,
Can anyone explain to me why this super simple script ain't working? I
want to listen for key strokes until the user presses the Esc-button.
What am I doing wrong?

// Test Class
var KeyboardListener = new Class({
    logging: true,
    initialize: function() {
        this.startListening();
    },
    log: function() {
        if (this.logging) {
            if (window['console']) {
                console.log($A(arguments).join('\n'));
            }
            else {
                alert($A(arguments).join('\n'));
            }
        }
    },
    startListening: function() {
        this.log('start listening ...');
        window.addEvent('keydown', this.keydownHandler.bindWithEvent
(this));
    },
    keydownHandler: function(e) {
        if (e.key == 'esc') {
            this.log(e.key, 'stop listening ...');
            window.removeEvent('keydown', this.keydownHandler);
        }
        else {
            this.log(e.key);
        }
    }
});

// Implementation
window.addEvent('domready', function() {
    new KeyboardListener();
});

Thanks!
/Martin