fix: fix IPV4Box key handling in DataGrid. Add a SampleBox project for extra testing. Upgrade to released version.

demo/Sandbox/ViewModels/MainWindowViewModel.cs

@@ -0,0 +1,30 @@
+using System.Collections.ObjectModel;
+using System.Net;
+
+namespace Sandbox.ViewModels;
+
+public partial class MainWindowViewModel : ViewModelBase
+{
+    public ObservableCollection<DataGridItem> Items { get; set; }
+
+    public MainWindowViewModel()
+    {
+        Items = new ObservableCollection<DataGridItem>()
+        {
+            new DataGridItem() { Name = "John Doe", Age = 42 },
+            new DataGridItem() { Name = "Jane Doe", Age = 39 },
+            new DataGridItem() { Name = "Sammy Doe", Age = 13 },
+            new DataGridItem() { Name = "Barry Doe", Age = 7 },
+            new DataGridItem() { Name = "Molly Doe", Age = 5 },
+        };
+    }
+    
+    
+}
+
+public class DataGridItem
+{
+    public string? Name { get; set; }
+    public int Age { get; set; }
+    public IPAddress? Address { get; set; }
+}