optimized and add diagnostic feature

Billing.Shared/UI/Converters.cs

@@ -244,4 +244,23 @@ namespace Billing.UI
             throw new NotImplementedException();
         }
     }
+
+    public class TintColorConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is long l)
+            {
+                return l.IsTransparent() ?
+                    BaseTheme.CurrentPrimaryColor :
+                    l.ToColor();
+            }
+            return Color.Transparent;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
 }