With OpenLayers and MG OS >= 2.1, with GETDYNAMICOVERLAYIMAGE, setting * useOverlay*=true in map options, and *useAsyncOverlay*=true in map params, showLayers/hideLayers is the same as GETMAPIMAGE.
The thing I always forget is where to set useOverlay and where useAsyncOverlay. If using overlay, in params must be set BEHAVIOR = 2 [I use 3 or 7] otherwise ovelay don't work [this was hard to find!]: http://trac.osgeo.org/mapguide/wiki/MapGuideRfc38 For MG OS <=2.0.2 you cannot use useAsyncOverlay, ovelays are synchronous, and, in my advise, should not be used [the request is blocking]. Regards, Pietro Ianniello
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