I totally misread your question (I thought you were referring to GETMAPIMAGE)
You need to prefix the SELECTIONCOLOR with "0x" as indicated here: https://trac.osgeo.org/mapguide/wiki/HttpApi/RenderingService#GetDynamicMapOverlayImage2.1 - Jackie -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Set-selection-color-using-MaestroAPI-6-tp5322623p5323155.html Sent from the MapGuide Users mailing list archive at Nabble.com. _______________________________________________ mapguide-users mailing list mapguide-users@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/mapguide-users