Sample plugin with button

<!--element -->
<textarea id="content"></textarea>

<!-- plugin code -->
<script>
(function($R)
{
    $R.add('plugin', 'myplugin', {
        translations: {
            en: {
                "myplugin": "My Plugin"
            }
        },
        init: function(app)
        {
            // define app
            this.app = app;

            // define services
            this.lang = app.lang;
            this.toolbar = app.toolbar;
        },
        start: function()
        {
            // create the button data
            var buttonData = {
                title: this.lang.get('myplugin'),
                api: 'plugin.myplugin.toggle'
            };

            // create the button
            var $button = this.toolbar.addButton('myplugin', buttonData);
        },
        toggle: function()
        {
            alert('My Plugin is toggled!');
        }
    });
})(Redactor);
</script>

<!-- call -->
<script>
$R('#content', { plugins: ['myplugin'] });
</script>