diff --git a/PartPreviewWindow/BranchEditContainer.cs b/PartPreviewWindow/BranchEditContainer.cs
index 2432b57cc..41d45b3a6 100644
--- a/PartPreviewWindow/BranchEditContainer.cs
+++ b/PartPreviewWindow/BranchEditContainer.cs
@@ -52,6 +52,10 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
 		public Type DefaultView => null;
 
+		public BranchEditContainer()
+		{
+		}
+
 		public BranchEditContainer(Action<ILibraryItem, IObject3D> saveAction)
 		{
 			this.saveAction = saveAction;
@@ -72,6 +76,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
 		public void Add(IEnumerable<ILibraryItem> items)
 		{
+			this.ContentChanged?.Invoke(this, null);
 		}
 
 		public bool AllowAction(ContainerActions containerActions)
diff --git a/Tests/MatterControl.AutomationTests/LibraryContainerTests.cs b/Tests/MatterControl.AutomationTests/LibraryContainerTests.cs
index 952cae970..8508d9996 100644
--- a/Tests/MatterControl.AutomationTests/LibraryContainerTests.cs
+++ b/Tests/MatterControl.AutomationTests/LibraryContainerTests.cs
@@ -224,6 +224,10 @@ namespace MatterControl.Tests.MatterControl
 			onIdlePumpActive = false;
 		}
 
+		[Test, Ignore("Not implemented")]
+		public async Task BranchEditContainerTest()
+		{
+		}
 
 		[Test, Ignore("Not implemented")]
 		public async Task CalibrationPartsContainerTest()