Image widget not attached?

UiBinder template extract:

         <div ui:field='myView' style='position:absolute; top:0; bot:0; left:0; right:0;' class='{style.hidden}'>
             <g:Image ui:field="myImage"/>
             <g:Button ui:field='closeButton' addStyleNames='{style.close-button}'>
                 <ui:text from='{strings.close}'/>
             </g:Button>
         </div>

The div's container is the HTMLPanel at the root of the template.

    @UiField Image      myImage;
    ...
    myImage.setUrlAndVisibleRect(url, 0, 0, width, height);

By debugger inspection I see that at the point at which setUrl... is to be called, the Image has attached: false. What am I overlooking? (This is my first use of gwt-Image.)

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