private Collection <BitmapImage> GetSymbolTypeListItems() { Collection <BitmapImage> images = new Collection <BitmapImage>(); PointStyle pointStyle = new PointStyle(); pointStyle.SymbolSize = 14; pointStyle.SymbolSolidBrush = new GeoSolidBrush(GeoColor.StandardColors.Black); pointStyle.SymbolPen = new GeoPen(GeoColor.SimpleColors.Black); var bufferUnitNames = Enum.GetValues(typeof(PointSymbolType)); foreach (var item in bufferUnitNames) { pointStyle.SymbolType = (PointSymbolType)item; BitmapImage bitmapImage = pointStyle.GetPreviewImage(16, 16); images.Add(bitmapImage); } return(images); }