foo.diff

diff --git a/src/XamarinProfiler.Mac/TraceDocument.cs b/src/XamarinProfiler.Mac/TraceDocument.cs
index 43eba2f..f7182e7 100644
--- a/src/XamarinProfiler.Mac/TraceDocument.cs
+++ b/src/XamarinProfiler.Mac/TraceDocument.cs
@@ -221,6 +221,7 @@ namespace XamarinProfiler.Mac
 			windowController.Window.DidBecomeKey += OnWindowReady;
 		}
 
+		static HashSet<NSObject> save = new HashSet<NSObject>();
 		public override void AwakeFromNib ()
 		{
 			base.AwakeFromNib ();
@@ -262,6 +263,7 @@ namespace XamarinProfiler.Mac
 				},
 				(splitView, indexer) => true
 			);
+			save.Add (MainSplitView.Delegate);
 
 			foreach (var subview in InstrumentSplitView.Subviews) {
 				subview.WantsLayer = true;
@@ -298,6 +300,7 @@ namespace XamarinProfiler.Mac
 					return true;
 				}
 			);
+			save.Add (InstrumentSplitView.Delegate);
 
 			ProcessSelectorButton.ProcessChanged += (sender, e) => {
 				ProcessSelectorButton.DisplayDeviceName = Environment.MachineName;