Dynamic Legend widget 3.1.2 and tiled layers

Hi all, one thing that I noticed is that type=tiled layers don't seem to be registering in the dynamic legend? For example:
<layer label="Demographics" type="tiled" visible="true" alpha="0.5"
url="http://server.arcgisonline.com/ArcGIS/rest/services/Demographics/USA_Median_Household_Income/MapServer"/>

Thanks!

Dan