Calling an existing FCK style command from a plugin

I could successfully implement a plugin for fckeditor in a drupal environment to get me a button in the dialog which responds to onclick events. However I don't manage it to get called e.g. an existing style function, e.g. I just want the button to color the selected text in blue.

I tried to somehow attaching the color command onlick event to the own button event kind of like

AddEventListener(button, 'click', FCKTextColorCommand_OnClick, [ this, '#00f' ] ) ;

but that's probably just utterly wrong.

The plugin code is

(function ($) {
    Drupal.wysiwyg.plugins['bluecolorbutton'] = {
        invoke: function(data, settings, instanceId) {
            if (CKEDITOR) {
                var editor = CKEDITOR.instances[instanceId];
                if (editor) {            
                    CKEDITOR.dialog.add('bluecolor',function(a){

                    // just want to route to the fcktextcolorcommand here...

                    });

                     CKEDITOR.dialog(editor, 'bluecolor');
                }
            }
        }
    };
})(jQuery);

I have ckedior Version 2.6.5 running.

thanks in advance