Fix issue 11954: [Dark Mode] ToolTip is not in dark mode after enabled SystemColorMode.Dark - #14381
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SimonZhao888
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ricardobossan
March 11, 2026 08:27
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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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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## main #14381 +/- ##
===================================================
+ Coverage 77.31249% 77.31573% +0.00324%
===================================================
Files 3265 3265
Lines 644447 644451 +4
Branches 47631 47632 +1
===================================================
+ Hits 498238 498262 +24
+ Misses 142512 142499 -13
+ Partials 3697 3690 -7
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Fixes #11954
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Microsoft Reviewers: Open in CodeFlow