Fixed contextual tabs

Filtration.Common/Converters/BooleanVisibilityConverter.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace Filtration.Common.Converters
+{
+    public class BooleanVisibilityConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is bool && targetType == typeof (Visibility))
+            {
+                var val = (bool) value;
+                if (val)
+                {
+                    return Visibility.Visible;
+                }
+                if (parameter is Visibility)
+                {
+                    return parameter;
+                }
+                return Visibility.Collapsed;
+            }
+            if (value != null)
+            {
+                return Visibility.Visible;
+            }
+
+
+            if (parameter is Visibility)
+            {
+                return parameter;
+            }
+            return Visibility.Collapsed;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}