UiObject not supported in UiBinder's declarative XML ?

The GWT plugin generates the type UiObject for HTML only UiBinder, However this class cannot be used in other widgets ui.xml
That is, for something like this:

<g:HTMLPanel>
<app:MyUiObjectWidget />
</g:HTMLPanel>

At compile time GWT says : [ERROR] Not allowed in an HTML context Element <app:MyUiObjectWidget>.

Can anyone help ?

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