Add project files.

LastItemIndexConverter.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Controls;
+using System.Windows.Data;
+
+namespace SafeBagDE70
+{
+    public class LastItemIndexConverter : IMultiValueConverter
+    {
+        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (values.Length >= 1 && values[0] is string Name)
+            {
+                if (Name == "Tổng")
+                {
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}