Fix issue 11954: [Dark Mode] ToolTip is not in dark mode after enabled SystemColorMode.Dark#14381
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SimonZhao888 wants to merge 3 commits intodotnet:mainfrom
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Fix issue 11954: [Dark Mode] ToolTip is not in dark mode after enabled SystemColorMode.Dark#14381SimonZhao888 wants to merge 3 commits intodotnet:mainfrom
SimonZhao888 wants to merge 3 commits intodotnet:mainfrom
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…d SystemColorMode.Dark
SimonZhao888
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LeafShi1,
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Pull request overview
Adds dark mode theming for WinForms ToolTip windows when Application.SetColorMode(SystemColorMode.Dark) is enabled, aligning tooltip rendering with the rest of the app’s dark mode experience (issue #11954).
Changes:
- Apply a dark-mode window theme to the tooltip HWND during handle creation when dark mode is enabled.
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src/System.Windows.Forms/System/Windows/Forms/ToolTip/ToolTip.cs
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src/System.Windows.Forms/System/Windows/Forms/ToolTip/ToolTip.cs
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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## main #14381 +/- ##
===================================================
+ Coverage 77.31249% 77.31573% +0.00324%
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Files 3265 3265
Lines 644447 644451 +4
Branches 47631 47632 +1
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+ Hits 498238 498262 +24
+ Misses 142512 142499 -13
+ Partials 3697 3690 -7
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LeafShi1
reviewed
Mar 12, 2026
src/System.Windows.Forms/System/Windows/Forms/ToolTip/ToolTip.cs
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ricardobossan
approved these changes
Mar 16, 2026
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Fixes #11954
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