UiBinder using Element and appendChild(child) possible?

Hi,
I wanted to create some lightweight Elements using UiBinder. I've
created a 'root' Element called GlassPanel:

(.ui.xml)
<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder"
xmlns:g="urn:import:com.google.gwt.user.client.ui">

<div ui:field="panel">
<div style="someStyles..." />
</div>
</ui:UiBinder>

(.java)
public class GlassPanel extends UiObject {
interface GlassUiBinder extends UiBinder<DivElement, GlassPanel> {}
private static GlassUiBinder uiBinder =
GWT.create(GlassUiBinder.class);

@UiField DivElement panel;

public GlassPanel() {
setElement(uiBinder.createAndBindUi(this));
}
}

There will now be several other Elements that should use this one as
their 'root'. I want to do something like this:

(.ui.xml)
<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder"
xmlns:g="urn:import:com.google.gwt.user.client.ui">

<e:GlassPanel>
<span ui:field="messagePanel"/>
</e:GlassPanel>
</ui:UiBinder>

It works if I say that GlassPanel.java implements HasHTML. But then
UiBinder uses the setHTML method which kills the inner div in my
GlassPanel panel. Instead it would be cool if it could call
'appendChild()' on my GlassPanel panel and simply add the additional
Element. Is it possible?
Maybe somehow using @UiChild ?!

I'm using Eclipse 3.7 and GWT 2.4.

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