How can i access my own custom tag using WatiN

Question

Suppose, if i have a element like this in page

<ele id="g" type="elebox">

I want to use custom type for this, I tried to use ElementContainer for creating a custom type and use ElementOfType to find this control in the document. But it is not seems to be working out.

[ElementTag("ele")]
public class Ele : ElementContainer<Element> {
/* constructurs with DomContainer, ElementFinder */
}

and

ElementFactory.RegisterElementType(typeof(Ele));    
browser.ElementOfType<Ele>("g")

returns null. Any help is greatly appreciated.