diff --git a/ILSpy/Docking/DockWorkspace.cs b/ILSpy/Docking/DockWorkspace.cs
index cc69c7bdac..3ad6aaf83d 100644
--- a/ILSpy/Docking/DockWorkspace.cs
+++ b/ILSpy/Docking/DockWorkspace.cs
@@ -123,11 +123,9 @@ public void AddTabPage(TabPageModel tabPage = null)
 
 		public ReadOnlyObservableCollection<TabPageModel> TabPages { get; }
 
-		public ReadOnlyCollection<ToolPaneModel> ToolPanes => exportProvider
-			.GetExportedValues<ToolPaneModel>("ToolPane")
-			.OrderBy(item => item.Title)
-			.ToArray()
-			.AsReadOnly();
+		private ToolPaneModel[] toolPanes = [];
+
+		public ReadOnlyCollection<ToolPaneModel> ToolPanes => toolPanes.AsReadOnly();
 
 		public bool ShowToolPane(string contentId)
 		{
@@ -183,6 +181,12 @@ public void InitializeLayout()
 				AddTabPage();
 			}
 
+			toolPanes = exportProvider
+				.GetExportedValues<ToolPaneModel>("ToolPane")
+				.OrderBy(item => item.Title)
+				.ToArray();
+			OnPropertyChanged(nameof(ToolPanes));
+
 			DockingManager.LayoutUpdateStrategy = this;
 			XmlLayoutSerializer serializer = new XmlLayoutSerializer(DockingManager);
 			serializer.LayoutSerializationCallback += LayoutSerializationCallback;