From b9c8a989ab0d88b52a48d6d26f98548a0ec3a6ff Mon Sep 17 00:00:00 2001
From: Max Katz <maxkatz6@outlook.com>
Date: Fri, 2 Jun 2023 07:48:06 -0400
Subject: [PATCH] Add ControlThemeOverride

---
 src/Avalonia.Base/StyledElement.cs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Avalonia.Base/StyledElement.cs b/src/Avalonia.Base/StyledElement.cs
index b98e378338..42a930c846 100644
--- a/src/Avalonia.Base/StyledElement.cs
+++ b/src/Avalonia.Base/StyledElement.cs
@@ -304,6 +304,8 @@ namespace Avalonia
         /// </remarks>
         protected virtual Type StyleKeyOverride => GetType();
 
+        protected virtual ControlTheme? ControlThemeOverride => null;
+
         /// <summary>
         /// Gets a value indicating whether the element is attached to a rooted logical tree.
         /// </summary>
@@ -688,7 +690,7 @@ namespace Avalonia
                 if (this.TryFindResource(key, out var value) && value is ControlTheme t)
                     _implicitTheme = t;
                 else
-                    _implicitTheme = s_invalidTheme;
+                    _implicitTheme = ControlThemeOverride ?? s_invalidTheme;
             }
 
             if (_implicitTheme != s_invalidTheme)