More theme changes

Filtration.Common/Converters/BooleanInverterConverter.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace Filtration.Common.Converters
+{
+    internal class BoolInverterConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter,
+            CultureInfo culture)
+        {
+            if (value is bool)
+            {
+                return !(bool)value;
+            }
+            return value;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter,
+            CultureInfo culture)
+        {
+            if (value is bool)
+            {
+                return !(bool)value;
+            }
+            return value;
+        }
+    }
+}