tinymce.PluginManager.add('cpBlock', function(editor, url) {

    editor.addButton('cpBlock', {
        image: 'data:image/png;base64,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',
        tooltip: 'Blocks',
        onclick: open_Browser
    });

    function open_Browser() {

        editor.windowManager.open({
            title: 'Select Block',
            width: 500,
            height: 400,
            url: '/cp/tmce/plugin/block'
        });
    }
});