Hi Palli ,
I think SignalR is powerful for build real-time, Comet Application , Sometimes its useful, you should consider to Add like this mechanism to VWG, Personally , I do not like using Timer Control to achieve the same effect.
I agree with you that eventually Comet will find its way into the Visual WebGui framework in some form or the other. Whether it will be offered as a part of the standard framework, submitted as sample code or even submitted by a community member as a sample code we do not know yet.
Thanks for your pointer on SignalR.