How do I use a GWT component in Vaadin

Is there any documentation about porting GWT components to Vaadin?
Sorry, it might sound stupid. I am new to Vaadin.

Dont' worry, it's not a stupid question at all. Check out Book chapter 10.4. You should also search the forums. Basically, you just have to

1) write the server-side counterpart of the component
2) implement client-server communications on the client-side class. You could just extend the GWT component if possible, or use an integration class like in the Colorpicker example.

Thanks for promptly response. Actually I am trying to use Ext GWT in Vaadin. From the guide you showed me, I seem have to implement a "fake" Java class to communicate Ext GWT. But, there are too many widgets. Is there a better way? Has anyone done this before?

What's the reason you want to use ExtGWT? If it's a small set of features you need, it might actually be easier to just extend the Vaadin components.

Did you see their demo? It is really impressive. I know you guys are improving Vaadin fast but, in my opinion, ExtGWT is really ahead in many ways. However, I have trouble to access the backend service with ExtGWT and I like Vaadin's approach. If someone integrated them, it will be a killer. I thought they are both GWT based and shall not be hard, but I am new to Vaadin.