Sorry, that was a typo as I was trying to convert things to a more generic example. The code I used was essentially the one you suggest:

public mmBindingList<MyWinDings> GetMyWinDings(string type)
{
     return this.GetEntityList<MyWinDings>("GetMyWindingsByType",
          this.CreateParameter("@type", type));
}

the essential problem I assume is that the compiler doesn't recognize the mmBindingList. And I'm wondering if I should be using some other class?