This method returns the configuration object for the Start Button. A derived
class can override this method, call the base version to build the config and
then modify the returned object before returning it.
function () {
        var me = this,
            cfg = {
                app: me,
                menu: []
            },
            launcher;

        Ext.apply(cfg, me.startConfig);

        Ext.each(me.modules, function (module) {
            launcher = module.launcher;
            if (launcher) {
                launcher.handler = launcher.handler || Ext.bind(me.createWindow, me, [module]);
                cfg.menu.push(module.launcher);
            }
        });

        return cfg;
    }