I am trying to add a new MapType (not an overlay) with my own tiles.
Using the example code at 
http://code.google.com/apis/maps/documentation/v3/overlays.html#ImageMapTypes
and providing my own getTileUrl function, my image tiles render great
as an overlay.

However, I want a new MapType not an overlay. My understanding (from
http://code.google.com/apis/maps/documentation/v3/reference.html#MapTypeRegistry)
is that I should be adding the ImageMapType to Map.mapTypes with:

map.mapTypes.set('ID', myImageMapType);

This results in the JavaScript error "Expected value implementing
google.maps.MapType"

You can reproduce this error by using the traffic example at
http://code.google.com/apis/maps/documentation/v3/overlays.html#ImageMapTypes
and replacing:

  map.overlayMapTypes.insertAt(0, trafficMapType);

with

  map.mapTypes.set("traffic", trafficMapType);

This implies that you can't use ImageMapType as a standalone MapType
or I've misunderstood something along the way.

Any insights?

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