From a3dbf72947d4e971325cd2870b19e99cd4ae65c5 Mon Sep 17 00:00:00 2001
From: Andrey Kunchev <donandren@gmail.com>
Date: Thu, 31 Oct 2019 15:03:33 +0200
Subject: [PATCH] don't  try open tooltip on detached control

---
 src/Avalonia.Controls/ToolTipService.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Avalonia.Controls/ToolTipService.cs b/src/Avalonia.Controls/ToolTipService.cs
index 384a9db0cf..d90729e8a5 100644
--- a/src/Avalonia.Controls/ToolTipService.cs
+++ b/src/Avalonia.Controls/ToolTipService.cs
@@ -1,6 +1,7 @@
 using System;
 using Avalonia.Input;
 using Avalonia.Threading;
+using Avalonia.VisualTree;
 
 namespace Avalonia.Controls
 {
@@ -79,7 +80,10 @@ namespace Avalonia.Controls
         {
             StopTimer();
 
-            ToolTip.SetIsOpen(control, true);
+            if ((control as IVisual).IsAttachedToVisualTree)
+            {
+                ToolTip.SetIsOpen(control, true);
+            }
         }
 
         private void Close(Control control)