More theme changes

Filtration.Common/Converters/StringToVisibilityConverter.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace Filtration.Common.Converters
+{
+    internal class StringToVisibilityConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (String.IsNullOrEmpty((string)value))
+            {
+                return Visibility.Collapsed;
+            }
+            else
+            {
+                return Visibility.Visible;
+            }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}