Some devtools fixes

src/Avalonia.Diagnostics/Diagnostics/Screenshots/BaseRenderToStreamHandler.cs

@@ -8,9 +8,8 @@ namespace Avalonia.Diagnostics.Screenshots
     /// </summary>
     public abstract class BaseRenderToStreamHandler : IScreenshotHandler
     {
-
         /// <summary>
-        /// Get stream
+        /// Get stream to write a screenshot to.
         /// </summary>
         /// <param name="control"></param>
         /// <returns>stream to render the control</returns>

src/Avalonia.Diagnostics/Diagnostics/ViewModels/TreePageViewModel.cs

@@ -32,7 +32,7 @@ namespace Avalonia.Diagnostics.ViewModels
         public TreeNode? SelectedNode
         {
             get => _selectedNode;
-            private set
+            set
             {
                 if (RaiseAndSetIfChanged(ref _selectedNode, value))
                 {

src/Avalonia.Diagnostics/Diagnostics/Views/ControlDetailsView.xaml.cs

@@ -30,7 +30,7 @@ namespace Avalonia.Diagnostics.Views
             
         }
 
-        private void PropertyNamePressed(object sender, PointerPressedEventArgs e)
+        public void PropertyNamePressed(object sender, PointerPressedEventArgs e)
         {
             var mainVm = (ControlDetailsViewModel?) DataContext;