Fix issue 14778: Controls inside GroupBox no longer reflect inherited ForeColor/BackColor updates in VisualStylesMode.Net11

src/System.Windows.Forms/System/Windows/Forms/Controls/Buttons/ButtonInternal/CheckBoxModernAdapter.cs

@@ -124,10 +124,10 @@ private void PaintCore(PaintEventArgs e)
 
         PaintImage(e, layout);
 
-        Color preferredTextColor = Control.ShouldSerializeForeColor()
+        Color preferredTextColor = Control.ShouldSerializeForeColor() || Control.ForeColor != Forms.Control.DefaultForeColor
             ? Control.ForeColor
             : Application.IsDarkModeEnabled
-                ? Color.FromArgb(0xF0, 0xF0, 0xF0)
+                ? DarkModeButtonColors.DefaultColors.AcceptButtonTextColor // Use the default accept button text color in dark mode for checkboxes.
                 : SystemColors.WindowText;
         Color disabledTextBackColor = Control.ShouldSerializeBackColor()
             && Control.BackColor.A == byte.MaxValue

src/System.Windows.Forms/System/Windows/Forms/Controls/Buttons/ButtonInternal/DarkMode/ButtonDarkModeAdapter.cs

@@ -55,7 +55,7 @@ private Color GetButtonTextColor(
         }
 
         bool useEffectiveForeColor = _modern
-            ? Control.ShouldSerializeForeColor()
+            ? Control.ShouldSerializeForeColor() || Control.ForeColor != Forms.Control.DefaultForeColor
             : Control.ForeColor != Forms.Control.DefaultForeColor;
 
         if (useEffectiveForeColor)
@@ -95,11 +95,11 @@ private Color GetButtonBackColor(PushButtonState state)
         }
         else
         {
-            bool hasExplicitBackColor = Control.ShouldSerializeBackColor();
-            bool hasUsableAmbientBackColor = !Control.BackColor.HasTransparency()
-                && Control.BackColor != Forms.Control.DefaultBackColor;
+            bool hasCustomBackColor = _modern
+                ? Control.ShouldSerializeBackColor()
+                : Control.BackColor != Forms.Control.DefaultBackColor;
 
-            if (hasExplicitBackColor || hasUsableAmbientBackColor)
+            if (hasCustomBackColor)
             {
                 backColor = ButtonDarkModeRenderer.GetBackgroundColor(
                     state,

src/System.Windows.Forms/System/Windows/Forms/Controls/Buttons/ButtonInternal/RadioButtonModernAdapter.cs

@@ -124,10 +124,10 @@ private void PaintCore(PaintEventArgs e)
 
         PaintImage(e, layout);
 
-        Color preferredTextColor = Control.ShouldSerializeForeColor()
+        Color preferredTextColor = Control.ShouldSerializeForeColor() || Control.ForeColor != Forms.Control.DefaultForeColor
             ? Control.ForeColor
             : Application.IsDarkModeEnabled
-                ? Color.FromArgb(0xF0, 0xF0, 0xF0)
+                ? DarkModeButtonColors.DefaultColors.AcceptButtonTextColor // Use the default accept button text color in dark mode for radio buttons.
                 : SystemColors.WindowText;
         Color disabledTextBackColor = Control.ShouldSerializeBackColor()
             && Control.BackColor.A == byte.MaxValue

src/System.Windows.Forms/System/Windows/Forms/Rendering/Button/AnimatedPopupButtonRenderer.cs

@@ -1,4 +1,4 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Drawing;
@@ -9,7 +9,7 @@
 namespace System.Windows.Forms.Rendering.Button;
 
 /// <summary>
-///  Drives and renders a <see cref="Forms.ButtonBase"/> whose <see cref="Forms.ButtonBase.FlatStyle"/> is
+///  Drives and renders a <see cref="ButtonBase"/> whose <see cref="ButtonBase.FlatStyle"/> is
 ///  <see cref="FlatStyle.Popup"/> when modern visual styles or dark mode are active, using the concave key-cap
 ///  look of <see cref="PopupButtonKeyCapRenderer"/>.
 /// </summary>
@@ -119,6 +119,7 @@ public override void RenderControl(Graphics graphics)
         Color faceColor;
         Color foreColor;
         Color borderColor;
+        bool useAutomaticForeColor = false;
 
         if (highContrast)
         {
@@ -138,9 +139,8 @@ public override void RenderControl(Graphics graphics)
 
             faceColor = PopupButtonColorMath.Blend(baseColor, hoverColor, _hoverCurrent);
             faceColor = PopupButtonColorMath.Blend(faceColor, pressedColor, _pressCurrent);
-            bool useAutomaticForeColor = button.EffectiveVisualStylesModeInternal >= VisualStylesMode.Net11
-                ? !button.ShouldSerializeForeColor()
-                : button.ForeColor == Forms.Control.DefaultForeColor;
+            useAutomaticForeColor = button.ForeColor == Control.DefaultForeColor
+                && !button.ShouldSerializeForeColor();
             foreColor = !useAutomaticForeColor
                 ? button.ForeColor
                 : _baseColorRenderer.GetTextColor(state, button.IsDefault, faceColor);
@@ -157,9 +157,7 @@ public override void RenderControl(Graphics graphics)
             BackColor = faceColor,
             ForeColor = foreColor,
             SurfaceColor = button.Parent?.BackColor ?? button.BackColor,
-            UseAutomaticForeColor = button.EffectiveVisualStylesModeInternal >= VisualStylesMode.Net11
-                ? !button.ShouldSerializeForeColor()
-                : button.ForeColor == Forms.Control.DefaultForeColor,
+            UseAutomaticForeColor = useAutomaticForeColor,
             BorderColor = borderColor,
             BorderWidth = flatAppearance.BorderSize,
             Enabled = button.Enabled,
@@ -233,12 +231,14 @@ public override void RenderControl(Graphics graphics)
 
     internal (Color BaseColor, Color HoverColor, Color PressedColor) GetStateColors()
     {
-        Forms.ButtonBase button = Button;
+        ButtonBase button = Button;
         FlatButtonAppearance flatAppearance = button.FlatAppearance;
         _baseColorRenderer.DeviceDpi = button.DeviceDpi;
         _baseColorRenderer.FlatAppearance = flatAppearance;
 
-        bool hasCustomBackColor = button.BackColor != Forms.Control.DefaultBackColor;
+        bool hasCustomBackColor = button.EffectiveVisualStylesModeInternal >= VisualStylesMode.Net11
+            ? button.ShouldSerializeBackColor()
+            : button.BackColor != Control.DefaultBackColor;
         Color baseColor = hasCustomBackColor
             ? button.BackColor
             : _baseColorRenderer.GetBackgroundColor(PushButtonState.Normal, isDefault: false);

src/test/unit/System.Windows.Forms/System/Windows/Forms/ButtonVisualStylesTests.cs

@@ -814,6 +814,32 @@ public void ButtonDarkModeAdapter_InteractionPaintStateStartsColorAnimation()
         Assert.True(animator.IsRunning);
     }
 
+    [WinFormsFact]
+    public void ButtonDarkModeAdapter_InheritedBackColor_UsesThemeStateColorInNet11()
+    {
+        using Panel parent = new() { BackColor = Color.Red };
+        using Button button = new()
+        {
+            FlatStyle = FlatStyle.Standard,
+            VisualStylesMode = VisualStylesMode.Net11
+        };
+        parent.Controls.Add(button);
+        ButtonInternal.ButtonDarkModeAdapter adapter = new(button);
+        dynamic accessor = adapter.TestAccessor.Dynamic;
+        ModernButtonDarkModeRenderer neutralRenderer = new()
+        {
+            DeviceDpi = button.DeviceDpi,
+            FlatAppearance = button.FlatAppearance
+        };
+
+        Color actual = (Color)accessor.GetButtonBackColor(VisualStyles.PushButtonState.Normal);
+
+        Assert.Equal(
+            neutralRenderer.GetBackgroundColor(VisualStyles.PushButtonState.Normal, isDefault: false),
+            actual);
+        Assert.False(button.ShouldSerializeBackColor());
+    }
+
     public static TheoryData<Type, FlatStyle, ContentAlignment, TextImageRelation> ModernImageLayoutData
     {
         get
@@ -1276,7 +1302,7 @@ public void ButtonDarkModeAdapter_ExplicitForeColor_IsPreserved()
     }
 
     [WinFormsFact]
-    public void ButtonDarkModeAdapter_InheritedForeColor_UsesAutomaticContrast()
+    public void ButtonDarkModeAdapter_InheritedForeColor_IsPreservedInNet11()
     {
         using Panel parent = new() { ForeColor = Color.Red };
         using Button button = new()
@@ -1295,7 +1321,7 @@ public void ButtonDarkModeAdapter_InheritedForeColor_UsesAutomaticContrast()
             VisualStyles.PushButtonState.Normal,
             Color.White);
 
-        Assert.Equal(Color.Black, actual);
+        Assert.Equal(Color.Red, actual);
         Assert.False(button.ShouldSerializeForeColor());
     }
 

src/test/unit/System.Windows.Forms/System/Windows/Forms/PopupButtonVisualStylesTests.cs

@@ -203,6 +203,37 @@ public void AnimatedPopupButtonRenderer_CustomBackColor_DerivesNeutralStateColor
         Assert.Equal(PopupButtonColorMath.TowardsContrast(button.BackColor, 0.12f), pressedColor);
     }
 
+    [WinFormsFact]
+    public void AnimatedPopupButtonRenderer_InheritedBackColor_UsesThemeStateColorsInNet11()
+    {
+        using Panel parent = new() { BackColor = Color.Red };
+        using Button button = new()
+        {
+            FlatStyle = FlatStyle.Popup,
+            VisualStylesMode = VisualStylesMode.Net11
+        };
+        parent.Controls.Add(button);
+        using AnimatedPopupButtonRenderer renderer = new(button);
+        ModernButtonDarkModeRenderer neutralRenderer = new()
+        {
+            DeviceDpi = button.DeviceDpi,
+            FlatAppearance = button.FlatAppearance
+        };
+
+        (Color baseColor, Color hoverColor, Color pressedColor) = renderer.GetStateColors();
+
+        Assert.Equal(
+            neutralRenderer.GetBackgroundColor(VisualStyles.PushButtonState.Normal, isDefault: false),
+            baseColor);
+        Assert.Equal(
+            neutralRenderer.GetBackgroundColor(VisualStyles.PushButtonState.Hot, isDefault: false),
+            hoverColor);
+        Assert.Equal(
+            neutralRenderer.GetBackgroundColor(VisualStyles.PushButtonState.Pressed, isDefault: false),
+            pressedColor);
+        Assert.False(button.ShouldSerializeBackColor());
+    }
+
     [WinFormsFact]
     public void PopupButtonKeyCapRenderer_FocusedDefault_RendersWithoutThrow()
     {