using GWT to compile Vaading widgets on existing application

I’m new on Vaading framework, I come from GWT ria frameworks like gwt-ext and smartgwt programming.
I would to know if it’s possible to use Vaading as I was using smartgwt or gwt-ext, so adding vaading capabilities to an existing GWT project and use vaading’s widgets in client side compiling with GWT.
I read all the related arguments on the vaading book and make a search in various forums without any result can help me in that.
What I need is to use vaading widgets (client side, I suppose) without need to totally change my application structure, that use, for example, gwt-openlayers to manage maps, GWT RPC calls etc.
Any help is appreciate and welcome!
Thank you.