Added untracked files

Filtration/Converters/HashSignRemovalConverter.cs

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+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace Filtration.Converters
+{
+    internal class HashSignRemovalConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var inputString = (string) value;
+            return inputString.Replace("#", string.Empty);
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

Filtration/Views/ToolPanes/BlockGroupBrowserView.xaml.cs

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+using System.Windows;
+using System.Windows.Controls;
+
+namespace Filtration.Views.ToolPanes
+{
+    public partial class BlockGroupBrowserView
+    {
+        public BlockGroupBrowserView()
+        {
+            InitializeComponent();
+        }
+
+        private void BlockGroupCheckBox_Clicked(object sender, RoutedEventArgs e)
+        {
+            // Prevents the user from putting a ThreeState checkbox into the indeterminate state
+            // allowing the indeterminate state to only be set by the object itself.
+            var cb = e.Source as CheckBox;
+            if (cb != null && !cb.IsChecked.HasValue)
+            {
+                cb.IsChecked = false;
+            }
+        }
+    }
+}