Fixes snoopwpf#181 by getting logical children for Popup

Author: batzen

Snoop.Core/Data/Tree/PopupTreeItem.cs

@@ -0,0 +1,29 @@
+namespace Snoop.Data.Tree
+{
+    using System.Windows;
+    using System.Windows.Controls.Primitives;
+
+    public class PopupTreeItem : DependencyObjectTreeItem
+    {
+        public PopupTreeItem(Popup target, TreeItem parent, TreeService treeService)
+            : base(target, parent, treeService)
+        {
+            this.PopupTarget = target;
+        }
+
+        public Popup PopupTarget { get; }
+
+        protected override void ReloadCore()
+        {
+            base.ReloadCore();
+
+            if (this.TreeService.TreeType == TreeType.Visual)
+            {
+                foreach (var child in LogicalTreeHelper.GetChildren(this.PopupTarget))
+                {
+                    this.Children.Add(this.TreeService.Construct(child, this));
+                }
+            }
+        }
+    }
+}

Snoop.Core/Data/Tree/TreeService.cs

@@ -5,6 +5,7 @@
     using System.Windows;
     using System.Windows.Automation;
     using System.Windows.Automation.Peers;
+    using System.Windows.Controls.Primitives;
     using System.Windows.Media;
     using System.Windows.Media.Media3D;
 
@@ -50,6 +51,10 @@ public virtual TreeItem Construct(object target, TreeItem parent)
                     treeItem = new WindowTreeItem(window, parent, this);
                     break;
 
+                case Popup poup:
+                    treeItem = new PopupTreeItem(poup, parent, this);
+                    break;
+
                 case DependencyObject dependencyObject:
                     treeItem = new DependencyObjectTreeItem(dependencyObject, parent, this);
                     break;