With previous versions there was a way in the Layer Manager to show "Xref Layers", then a check box to invert the filter, showing only non Xref dependant layers.
Did the powers to be remove this in 05?
Is there a way to get it back? if I have to define a filter or a "group" can it be exported/imported so the non Xref depend layer filter does not have to defined for every dwg?