Add template project

Template/SettingsWindow/ItemWindow.xaml.cs

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+using System;
+using System.Windows;
+using ChrisKaczor.Wpf.Validation;
+
+namespace Template.SettingsWindow;
+
+public partial class ItemWindow
+{
+    public ItemWindow()
+    {
+        InitializeComponent();
+    }
+
+    public bool? Display(ItemEntry itemEntry, Window owner)
+    {
+        DataContext = itemEntry;
+
+        Title = string.IsNullOrWhiteSpace(itemEntry.Name) ? Properties.Resources.ItemWindowAdd : Properties.Resources.ItemWindowEdit;
+
+        Owner = owner;
+
+        return ShowDialog();
+    }
+
+    private void HandleOkayButtonClick(object sender, RoutedEventArgs e)
+    {
+        if (!this.IsValid())
+            return;
+
+        var item = (ItemEntry)DataContext;
+
+        if (!Data.ItemEntries.Contains(item))
+            Data.ItemEntries.Add(item);
+
+        Data.Save();
+
+        DialogResult = true;
+
+        Close();
+    }
+}