Начало работы над кастомным деревом вывода

Pf2eViewer/TestForm.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using Pf2eModel;
+using Pf2eModel.Model.Base;
+
+namespace Pf2eViewer;
+
+public partial class TestForm : Form
+{
+    public TestForm()
+    {
+        InitializeComponent();
+
+        _ = new DarkModeCS(this) { ColorMode = DarkModeCS.DisplayMode.SystemDefault };
+
+        Pf2eDbContext context = new();
+        int count = context.Entities.Count();
+        int id = Random.Shared.Next(1, count + 1);
+
+        Entity entity = context.Entities.FirstOrDefault(e => e.Id == id)!;
+
+        EntityView view = new(context, entity.Type, id);
+        entityTreeViewerControl1.EntityView = view;
+    }
+}