Update App.js

public/App.js

@@ -87,7 +87,7 @@ var initialPosition = Cesium.Cartesian3.fromDegrees(16.368084, 48.183257, 360);
 	
 	function showbuildings() {
 	 	 if (document.getElementById('buildings').checked) {building.show = true; outdoorbuildinginstallation.show = true;
-	roofsurface.show = false; 
+	roofsurface.show = true; 
 	} 
 	 else {building.show = false; outdoorbuildinginstallation.show = false;
 	roofsurface.show = false;}