Head material was added

Infrastructure/UI/Converters/Common/InvertBoolConverter.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Data;
+
+namespace StructureHelper.Infrastructure.UI.Converters.Common
+{
+    [ValueConversion(typeof(bool), typeof(bool))]
+    public class InvertBoolConverter : IValueConverter
+    {
+        public InvertBoolConverter()
+        {
+        }
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value != null && value is bool)
+            {
+                return !((bool)value);
+            }
+
+            return true;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return Convert(value, targetType, parameter, culture);
+        }
+    }
+}