Darken TabControl in dark mode

Author: willibrandon

src/System.Windows.Forms/System/Windows/Forms/Control.cs

@@ -162,6 +162,7 @@ public unsafe partial class Control :
     internal const string ExplorerThemeIdentifier = "Explorer";
     internal const string ItemsViewThemeIdentifier = "ItemsView";
     internal const string ComboBoxButtonThemeIdentifier = "CFD";
+    internal const string BannerContainerThemeIdentifier = "FileExplorerBannerContainer";
 
     private const short PaintLayerBackground = 1;
     private const short PaintLayerForeground = 2;

src/System.Windows.Forms/System/Windows/Forms/Controls/TabControl/TabControl.cs

@@ -1289,6 +1289,14 @@ protected override void OnHandleCreated(EventArgs e)
         }
 
         UpdateTabSelection(false);
+
+#pragma warning disable WFO5001
+        if (Application.IsDarkModeEnabled)
+        {
+            PInvoke.SetWindowTheme(HWND, null, $"{DarkModeIdentifier}::{BannerContainerThemeIdentifier}");
+            PInvokeCore.EnumChildWindows(this, StyleUpDown);
+        }
+#pragma warning restore WFO5001
     }
 
     protected override void OnHandleDestroyed(EventArgs e)
@@ -1771,6 +1779,9 @@ private bool ShouldSerializeItemSize()
         return !_padding.Equals(s_defaultPaddingPoint);
     }
 
+    private BOOL StyleUpDown(HWND handle)
+        => PInvoke.SetWindowTheme(handle, $"{DarkModeIdentifier}_{ExplorerThemeIdentifier}", null).Succeeded;
+
     /// <summary>
     ///  Returns a string representation for this control.
     /// </summary>