Hi, now I get t is null in viewer.js Line 24 Row 25281 -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Introducing-mapguide-react-layout-A-modern-viewer-for-MapGuide-tp5288019p5288246.html Sent from the MapGuide Users mailing list archive at Nabble.com.