From 1ce5fdfd03744932edcba0d7ef1654a4e454565e Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Thu, 21 May 2020 16:27:33 -0300
Subject: [PATCH] Update when caption buttons are turned on or off.

---
 src/Windows/Avalonia.Win32/WindowImpl.cs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/Windows/Avalonia.Win32/WindowImpl.cs b/src/Windows/Avalonia.Win32/WindowImpl.cs
index a88a342b00..d09e3196da 100644
--- a/src/Windows/Avalonia.Win32/WindowImpl.cs
+++ b/src/Windows/Avalonia.Win32/WindowImpl.cs
@@ -748,6 +748,16 @@ namespace Avalonia.Win32
 
                     DisableCloseButton(_hwnd);
                 }
+                else
+                {
+                    var style = GetStyle();
+
+                    style |= (WindowStyles.WS_MINIMIZEBOX | WindowStyles.WS_MAXIMIZEBOX | WindowStyles.WS_SYSMENU);
+
+                    SetStyle(style);
+
+                    EnableCloseButton(_hwnd);
+                }
             }
             else
             {
@@ -756,6 +766,14 @@ namespace Avalonia.Win32
 
                 _offScreenMargin = new Thickness();
                 _extendedMargins = new Thickness();
+
+                var style = GetStyle();
+
+                style |= (WindowStyles.WS_MINIMIZEBOX | WindowStyles.WS_MAXIMIZEBOX | WindowStyles.WS_SYSMENU);
+
+                SetStyle(style);
+
+                EnableCloseButton(_hwnd);
             }
 
             ExtendClientAreaToDecorationsChanged?.Invoke(true);