image sprite in uibinder not working

<ui:image field='logo' src='logo.png'/>
@sprite .logo {
gwt-image: 'logo';
position: absolute;
}
div class='{style.logo}'/> <div class='{style.logo}'/>

when i run my app, i can see in firebug.

image: url("data:image/
png;base64,iVBORw0KGgoAAAANSUhEUgAAAIwAAABLCAYAAACiLW8yAAAn4klEQVR42u19B1hUVxctMdEkRn
+Nv0aNRqMmxgoKImWAoQqKgooFsSs2sDeUiB2jMXZR7CJ2RSyh2EBUe..etc

arent it suppose to combined all <ui:image field='logo' src='logo.png'/
><ui:image field='logo2' src='logo2.png'/> into one big image rather
than encode it into stream like above?

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