I finally got it! The issue was that I need to ad a container/wrapper tag 
around the child using the tagname specified in the @UiChild

so
        <aj:CustomParent>
            <aj:myChild>
                <aj:CustomChild ui:field="aChild"></aj:CustomChild>
            </aj:myChild>
        </aj:CustomParent>

The CustomParent object has a method with annotation 
@UiChild(tagname="myChild") which is invoked with the <aj:CustomChild 
element

This is somewhat counter to the 'normal' way, which I guess I can implement 
if I use a custom parser.

However, as I noted in my initial question I was looking at other libraries 
to get an idea of how to do this and noted that GwtBootstrap3 does not seem 
to use any of the implementations mentioned here.

If anyone knows how I would appreciate some pointers. Even better if the 
GwtBootstrap3 guys happen to read this.
It would be more uniform if I didn't have to surround each child in a tag 
to invoke the add method for it

        <aj:CustomParent>
            <aj:myChild>
                <aj:CustomChild ui:field="child1"></aj:CustomChild>
            </aj:myChild>
            <aj:myChild>
                <aj:CustomChild ui:field="child2"></aj:CustomChild>
            </aj:myChild>
            <aj:myChild>
                <aj:CustomChild ui:field="child3"></aj:CustomChild>
            </aj:myChild>
        </aj:CustomParent>


Thanks for your help!

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