Delete element from a collection (JDev 10.1.2)

Hello
I have a bean which has a collection "testCollection" and accessors for it. This has been populated with some elements (similar to the LDAPDataControls example). I have created the data control for it and dragged the collection onto a JSP as a read only form. This displays the current element of the collection depending on the iterator position.
I then have a forward on the page using a button to a Data Action called RemoveAction. I have overwritten invokeCustomMethod and I'm trying to remove the element in the collection at the current iteraotr position.
I can access the iterator using actionContext.getBindingContainer().findIterator("testCollectionIterator");
From this I can get the current row but both row.remove() and row.removeFromCollection throw UnsupportedMethod exceptions.
I can access the collection using actionBinding.getBindingContainer().getDataControl().getDataProvider(), but I have no way of removing the object from the collection without having a reference to the object itself.
Please can someone explain how to remove elements from the collection?
Also can someone explain in the LDAPDataControls example why its also necessary to have a class called LDAPDataControl (type of DCGenericDataControl) and a LDAPDataControlFactory (type of DataControlFactoryImpl)?
Just having the classes LDAPSearch, the bean class LDAPEntry, and a class to hold the collection LDAPCollection works fine. Create the data control for LDAPCollection and drag the collection onto the JSP.
Thanks.

I'm still not sure about this. Can anyone help? Thanks.

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