Having to manually add categories in the reflection metadata for certain classes is a minor issue for client code. We should be able to detect this automatically, without requiring users to include it in their metadata, by, for example, identifying base classes.

The list of categories and classes I have detected is as follows:

W:\Noesis\NoesisSDK\Native\Src\Packages\Drawing\Types\Include\NsDrawing\Color.h(123):        NsMeta<Category>("Brushes");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\ImageBrush.cpp(158):    NsMeta<Category>("Brushes"); 
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\LinearGradientBrush.cpp(133):    NsMeta<Category>("Brushes");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\RadialGradientBrush.cpp(166):    NsMeta<Category>("Brushes"); 
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\VisualBrush.cpp(177):    NsMeta<Category>("Brushes");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\SolidColorBrush.cpp(165):    NsMeta<Category>("Brushes"); 

W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\AlternationConverter.cpp(80):    NsMeta<Category>("Converters");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\BooleanToVisibilityConverter.cpp(64):    NsMeta<Category>("Converters");

W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\ArcSegment.cpp(155):    NsMeta<Category>("Geometries");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\BezierSegment.cpp(123):    NsMeta<Category>("Geometries");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\CombinedGeometry.cpp(359):    NsMeta<Category>("Geometries");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\EllipseGeometry.cpp(225):    NsMeta<Category>("Geometries");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\LineSegment.cpp(90):    NsMeta<Category>("Geometries");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\LineGeometry.cpp(197):    NsMeta<Category>("Geometries");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\PathFigure.cpp(243):    NsMeta<Category>("Geometries");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\PathGeometry.cpp(304):    NsMeta<Category>("Geometries");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\PolyBezierSegment.cpp(143):    NsMeta<Category>("Geometries");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\PolyLineSegment.cpp(128):    NsMeta<Category>("Geometries");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\PolyQuadraticBezierSegment.cpp(140):    NsMeta<Category>("Geometries");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\QuadraticBezierSegment.cpp(107):    NsMeta<Category>("Geometries");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\RectangleGeometry.cpp(262):    NsMeta<Category>("Geometries");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\GeometryGroup.cpp(385):    NsMeta<Category>("Geometries");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\StreamGeometry.cpp(252):    NsMeta<Category>("Geometries");

W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\BitmapImage.cpp(269):    NsMeta<Category>("Bitmaps");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\CroppedBitmap.cpp(219):    NsMeta<Category>("Bitmaps");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\ImageSource.cpp(58):    NsMeta<Category>("Bitmaps");

W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\BlurEffect.cpp(94):    NsMeta<Category>("Effects");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\DropShadowEffect.cpp(192):    NsMeta<Category>("Effects");

W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\CompositeTransform.cpp(161):    NsMeta<Category>("Transforms");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\CompositeTransform3D.cpp(198):    NsMeta<Category>("Transforms");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\MatrixTransform.cpp(91):    NsMeta<Category>("Transforms");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\MatrixTransform3D.cpp(73):    NsMeta<Category>("Transforms");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\RotateTransform.cpp(107):    NsMeta<Category>("Transforms");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\ScaleTransform.cpp(120):    NsMeta<Category>("Transforms");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\SkewTransform.cpp(120):    NsMeta<Category>("Transforms");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\TransformGroup.cpp(280):    NsMeta<Category>("Transforms");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\TranslateTransform.cpp(96):    NsMeta<Category>("Transforms");

W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\ControlTemplate.cpp(112):    NsMeta<Category>("Controls");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\DataTemplate.cpp(97):    NsMeta<Category>("Controls");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\HierarchicalDataTemplate.cpp(110):    NsMeta<Category>("Controls");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\ItemsPanelTemplate.cpp(35):    NsMeta<Category>("Controls");
W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\Style.cpp(429):    NsMeta<Category>("Controls");

W:\Noesis\NoesisSDK\Native\Src\Packages\Gui\Core\Src\MultiBinding.cpp(221):    NsMeta<Category>("MarkupExtension");
W:\Noesis\NoesisSDK\Native\Src\Packages\App\ApplicationLauncher\Src\LocExtension.cpp(156):    NsMeta<Category>("MarkupExtension");