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Fix GroupBox doesn't apply ForeColor in ambient condition #14638

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Fix GroupBox doesn't apply ForeColor in ambient condition #14638

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f40e9bf
Added fix for issue 9958
Sathish-087 Jun 8, 2026
e90871a
Updated the review changes
Sathish-087 Jun 8, 2026
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16 changes: 15 additions & 1 deletion src/System.Windows.Forms/System/Windows/Forms/Controls/GroupBox/GroupBox.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -440,13 +440,27 @@ protected override void OnPaint(PaintEventArgs e)
}
else
{
GroupBoxRenderer.DrawGroupBox(
if (FindForm() is Form form && form.ForeColor != SystemColors.ControlText)

@LeafShi1 LeafShi1 Jun 17, 2026

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  1. The fix uses FindForm() which jumps directly to the top-level Form. If the GroupBox is inside a Panel or UserControl that has a custom ForeColor, the ambient color from that intermediate parent is ignored.

    WinForms ambient property inheritance walks the full parent chain. this.ForeColor already returns the correct inherited value from any ancestor. A simpler and more correct fix would be to check whether the inherited ForeColor differs from the default

  2. form.ForeColor != SystemColors.ControlText assumes the default form ForeColor is always SystemColors.ControlText. If a high-contrast theme or custom Windows theme changes the default, this comparison could produce incorrect results

{
GroupBoxRenderer.DrawGroupBox(
e,
new Rectangle(0, 0, Width, Height),
Text,
Font,
form.ForeColor,
textFlags,
gbState);
}
else
{
GroupBoxRenderer.DrawGroupBox(
e,
new Rectangle(0, 0, Width, Height),
Text,
Font,
textFlags,
gbState);
}
Comment on lines +443 to +463

@LeafShi1 LeafShi1 Jun 17, 2026

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Lines 457-462 (the inner else) have inconsistent indentation — the DrawGroupBox call arguments are not indented relative to the method call, unlike the rest of the file

}
}

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