From 40f65e42b6f7248a5ab1f5fce5554430dcfddae6 Mon Sep 17 00:00:00 2001
From: yutaka <shigure@refy.net>
Date: Thu, 19 Apr 2018 16:51:31 +0900
Subject: [PATCH] Check before Close in InternalClose

---
 .../Controls/LayoutFloatingWindowControl.cs                   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutFloatingWindowControl.cs b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutFloatingWindowControl.cs
index f8231f19..d38b41fe 100644
--- a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutFloatingWindowControl.cs
+++ b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/LayoutFloatingWindowControl.cs
@@ -476,6 +476,10 @@ namespace Xceed.Wpf.AvalonDock.Controls
 
     internal void InternalClose()
     {
+      if( _internalCloseFlag )
+      {
+        return;
+      }
       _internalCloseFlag = true;
       Close();
     }