Index: trunk/src/org/openstreetmap/josm/gui/mappaint/StyleSettingFactory.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/mappaint/StyleSettingFactory.java	(revision 16850)
+++ trunk/src/org/openstreetmap/josm/gui/mappaint/StyleSettingFactory.java	(revision 16857)
@@ -51,5 +51,5 @@
                 return forLabelAndDefault(c, Color.class, (label, defaultValue) -> {
                     final NamedColorProperty property = new NamedColorProperty(NamedColorProperty.COLOR_CATEGORY_MAPPAINT,
-                            parentStyle.getFileNamePart(), label, defaultValue);
+                            parentStyle.title == null ? "MapCSS" : parentStyle.title, label, defaultValue);
                     return new StyleSetting.ColorStyleSetting(parentStyle, label, property);
                 });