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Fix issue 11954: [Dark Mode] ToolTip is not in dark mode after enabled SystemColorMode.Dark #14381

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Fix issue 11954: [Dark Mode] ToolTip is not in dark mode after enabled SystemColorMode.Dark #14381

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Fix issue 11954: [Dark Mode] ToolTip is not in dark mode after enable…
Mar 11, 2026
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Mar 12, 2026
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Fix issue
Mar 12, 2026
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6 changes: 6 additions & 0 deletions src/System.Windows.Forms/System/Windows/Forms/ToolTip/ToolTip.cs
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Expand Up @@ -731,6 +731,12 @@ private unsafe void CreateHandle()
// Setting the max width has the added benefit of enabling multiline tool tips.
PInvokeCore.SendMessage(this, PInvoke.TTM_SETMAXTIPWIDTH, 0, SystemInformation.MaxWindowTrackSize.Width);

Form? activeForm = Form.ActiveForm;
if (Application.IsDarkModeEnabled && !SystemInformation.HighContrast && activeForm is not null && activeForm.DarkModeRequestState is true)
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{
PInvoke.SetWindowTheme(HWND, $"{Control.DarkModeIdentifier}_{Control.ExplorerThemeIdentifier}", null);
}

if (_auto)
{
// AutomaticDelay property should overwrite other delay timer values, _auto field indicates that
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