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Fix issue 14859: CheckBox and RadioButton ignore explicit BackColor values in VisualStylesMode.Net11 #14865

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Fix issue 14859: CheckBox and RadioButton ignore explicit BackColor values in VisualStylesMode.Net11 #14865

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9fd5f98
Fix issue 14859: CheckBox and RadioButton ignore explicit BackColor v…
Aug 7, 2026
a7e2280
Merge branch 'main' into Fix_Issue_14859
Aug 10, 2026
d95d37f
Sync the latest code and apply relevant fixes.
Aug 10, 2026
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18 changes: 13 additions & 5 deletions ...ndows.Forms/System/Windows/Forms/Controls/Buttons/ButtonInternal/CheckBoxModernAdapter.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -80,11 +80,19 @@ internal override LayoutOptions CommonLayout()
private void PaintCore(PaintEventArgs e)
{
Graphics graphics = e.GraphicsInternal;
ParentBackgroundRenderer.Paint(
Control,
graphics,
Control.ClientRectangle,
Control.BackColor);
if (!Control.UseVisualStyleBackColor && !Control.BackColor.HasTransparency())
{
using var backBrush = Control.BackColor.GetCachedSolidBrushScope();
graphics.FillRectangle(backBrush, Control.ClientRectangle);
}
else
{
ParentBackgroundRenderer.Paint(
Control,
graphics,
Control.ClientRectangle,
Control.BackColor);
}

LayoutData layout = Layout(e).Layout();
AdjustFocusRectangle(layout);
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18 changes: 13 additions & 5 deletions ...ws.Forms/System/Windows/Forms/Controls/Buttons/ButtonInternal/RadioButtonModernAdapter.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -79,11 +79,19 @@ internal override LayoutOptions CommonLayout()
private void PaintCore(PaintEventArgs e)
{
Graphics graphics = e.GraphicsInternal;
ParentBackgroundRenderer.Paint(
Control,
graphics,
Control.ClientRectangle,
Control.BackColor);
if (!Control.UseVisualStyleBackColor && !Control.BackColor.HasTransparency())
{
using var backBrush = Control.BackColor.GetCachedSolidBrushScope();
graphics.FillRectangle(backBrush, Control.ClientRectangle);
}
else
{
ParentBackgroundRenderer.Paint(
Control,
graphics,
Control.ClientRectangle,
Control.BackColor);
}

LayoutData layout = Layout(e).Layout();
AdjustFocusRectangle(layout);
Expand Down
26 changes: 26 additions & 0 deletions src/test/unit/System.Windows.Forms/System/Windows/Forms/CheckBoxTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -582,6 +582,7 @@ public void CheckBox_ModernGlyph_RendersAccentForCheckedStates(CheckState checkS
using CheckBox box = new()
{
BackColor = Color.Red,
UseVisualStyleBackColor = true,
CheckState = checkState,
Size = new Size(40, 24),
VisualStylesMode = VisualStylesMode.Net11
Expand All @@ -597,6 +598,31 @@ public void CheckBox_ModernGlyph_RendersAccentForCheckedStates(CheckState checkS
Assert.Equal(expectedAccent, CountPixels(bitmap, Color.Red) > 0);
}

[WinFormsFact]
public void CheckBox_ModernGlyph_UsesExplicitBackColorWhenVisualStyleBackgroundDisabled()
{
using Panel parent = new() { BackColor = Color.White };
using CheckBox box = new()
{
BackColor = Color.Aqua,
CheckState = CheckState.Unchecked,
Text = string.Empty,
Size = new Size(40, 24),
VisualStylesMode = VisualStylesMode.Net11
};

parent.Controls.Add(box);

using Bitmap bitmap = new(box.Width, box.Height);
using Graphics graphics = Graphics.FromImage(bitmap);
PaintEventArgs e = new(graphics, box.ClientRectangle);

box.CreateStandardAdapter().PaintUp(e, box.CheckState);

Color backgroundPixel = bitmap.GetPixel(box.Width - 2, box.Height / 2);
Assert.Equal(Color.Aqua.ToArgb(), backgroundPixel.ToArgb());
}

[WinFormsFact]
public void CheckBox_ModernGlyph_DefaultCheckedColorUsesWindowsAccent()
{
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26 changes: 26 additions & 0 deletions src/test/unit/System.Windows.Forms/System/Windows/Forms/RadioButtonTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -220,6 +220,7 @@ public void RadioButton_ModernGlyph_RendersAccentWhenChecked(bool isChecked, boo
using RadioButton control = new()
{
BackColor = Color.Red,
UseVisualStyleBackColor = true,
Checked = isChecked,
Size = new Size(40, 24),
VisualStylesMode = VisualStylesMode.Net11
Expand All @@ -237,6 +238,31 @@ public void RadioButton_ModernGlyph_RendersAccentWhenChecked(bool isChecked, boo
Assert.Equal(expectedAccent, CountPixels(bitmap, Color.Red) > 0);
}

[WinFormsFact]
public void RadioButton_ModernGlyph_UsesExplicitBackColorWhenVisualStyleBackgroundDisabled()
{
using Panel parent = new() { BackColor = Color.White };
using RadioButton control = new()
{
BackColor = Color.Aqua,
Checked = false,
Text = string.Empty,
Size = new Size(40, 24),
VisualStylesMode = VisualStylesMode.Net11
};

parent.Controls.Add(control);

using Bitmap bitmap = new(control.Width, control.Height);
using Graphics graphics = Graphics.FromImage(bitmap);
PaintEventArgs e = new(graphics, control.ClientRectangle);

control.CreateStandardAdapter().PaintUp(e, CheckState.Unchecked);

Color backgroundPixel = bitmap.GetPixel(control.Width - 2, control.Height / 2);
Assert.Equal(Color.Aqua.ToArgb(), backgroundPixel.ToArgb());
}

[WinFormsFact]
public void RadioButton_ModernGlyph_DefaultCheckedColorUsesWindowsAccent()
{
Expand Down
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