I have made it non-positioned and attached to a non-body parent element 
using following dirty workaround which I'm not sure is cross browser:

    PopupPanel popup = new PopupPanel(true) ;
    addCloseHandler(new CloseHandler<PopupPanel>() {
        @Override
        public void onClose(CloseEvent<PopupPanel> event) {
            popup.removeFromParent();
        }
    });

    popup.show();
    Element popupElement = popup.getElement();
    popupElement.removeFromParent();
    popupElement.getStyle().clearProperty("left");
    popupElement.getStyle().clearProperty("top");
    Element newParent = DOM.getElementById("new-parent-id");
    newParent.appendChild(popupElement);

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