It took me a bit to figure this out so I'd like to pass it on. I wanted to NOT open a cascading dropdown when loading it from another dropdown selection. This is done on the client side by passing a false as the 2nd parameter to the javascript load items method. It's not in my documentation so I'd like to add it here in case anyone else was looking for the same functionality.

itemNameDropdown.loadItems(intSubCategoryId,

false);