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OpenSep 2, 2026
No due date
•Last updated Milestone tracking issues not triaged to a planned release. Work in this milestone may happen, or may not: it is not committed.
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The ""cell error" icon can't be seen after selected the "CheckBox" cell of the DataGridView control
🪲 bugProduct bug (most likely)Product bug (most likely)🚧 work in progressWork that is current in progressWork that is current in progresshelp wantedGood issue for external contributorsGood issue for external contributorsStatus: Open.#1929 In dotnet/winforms;Unit test intermittently fails
test-bugProblem in test source code (most likely)Problem in test source code (most likely)Status: Open.#1460 In dotnet/winforms;Failing unit test: SiteNestedContainer_Add_Unloading_Nop
test-bugProblem in test source code (most likely)Problem in test source code (most likely)Status: Open.#1151 In dotnet/winforms;Unit test fails after arcade update
test-bugProblem in test source code (most likely)Problem in test source code (most likely)Status: Open.#1030 In dotnet/winforms;cachedTypes in AssemblyNamesTypeResolutionService is unreachable
🪲 bugProduct bug (most likely)Product bug (most likely)tenet-compatibilityIncompatibility with previous versions or with WinForms for .NET FrameworkIncompatibility with previous versions or with WinForms for .NET FrameworkStatus: Open.#229 In dotnet/winforms;RuntimeEnvironment.GetRuntimeInterfaceAsObject is not supported
area-VSTOVisual Studio Tools for Office and general Office interopVisual Studio Tools for Office and general Office interoptenet-compatibilityIncompatibility with previous versions or with WinForms for .NET FrameworkIncompatibility with previous versions or with WinForms for .NET FrameworkStatus: Open.#247 In dotnet/winforms;Consider keyboard shortcut to opt in/opt out of tooltips on keyboard navigation
enhancementProduct code improvement that does NOT require public API changes/additionsProduct code improvement that does NOT require public API changes/additionsStatus: Open.#802 In dotnet/winforms;Enable cross-thread checks by default
enhancementProduct code improvement that does NOT require public API changes/additionsProduct code improvement that does NOT require public API changes/additionsStatus: Open.#832 In dotnet/winforms;Conditional order of precedence (possible) bug in
AxHost.CanAccessPropertieschampion-requiredNeeds internal champion to shepherd issueNeeds internal champion to shepherd issuecode cleanupcleanup code for unused apis/properties/comments - no functional changes.cleanup code for unused apis/properties/comments - no functional changes.Status: Open.#1989 In dotnet/winforms;Question: Are there plans to separate Visual Styles from the OS?
questionGeneral question, not a problem in source code or documentation (yet)General question, not a problem in source code or documentation (yet)Status: Open.#1855 In dotnet/winforms;FormClosed event is raised twice for owned modal window when owner window is closed programatically
🪲 bugProduct bug (most likely)Product bug (most likely)help wantedGood issue for external contributorsGood issue for external contributorsStatus: Open.#2451 In dotnet/winforms;Performance issue with localizable controls and forms
tenet-localizationSuggested translations of resources; notification requiring translations; internationalizationSuggested translations of resources; notification requiring translations; internationalizationtenet-performanceImprove performance, flag performance regressions across core releasesImprove performance, flag performance regressions across core releasesStatus: Open.#2427 In dotnet/winforms;MonthCalendarincomplete hightlight of today date🪲 bugProduct bug (most likely)Product bug (most likely)external-OS-issueIssue caused by an external OS component such as Common Controls.Issue caused by an external OS component such as Common Controls.help wantedGood issue for external contributorsGood issue for external contributorsStatus: Open.#2662 In dotnet/winforms;MDI child form with ContainerControl/SplitContainer control activation bug: the control that gets focus is not the one that was previously focused
🪲 bugProduct bug (most likely)Product bug (most likely)Status: Open.#2799 In dotnet/winforms;Control.CreateHandle should specify dpiAwarenessContext (of current thread) in Application.ParkHandle
🪲 bugProduct bug (most likely)Product bug (most likely)area-HDPI-SAIssues related to high DPI SystemAware modeIssues related to high DPI SystemAware modeStatus: Open.#2279 In dotnet/winforms;NativeWindow AssignHandle/ReleaseHandle should use Set/RemoveWindowSubclass
enhancementProduct code improvement that does NOT require public API changes/additionsProduct code improvement that does NOT require public API changes/additionsStatus: Open.#2380 In dotnet/winforms;Update documentation and guides related to WinForms Accessibility
📚 documentationOpen issue here - https://github.com/dotnet/dotnet-api-docs/issuesOpen issue here - https://github.com/dotnet/dotnet-api-docs/issuestenet-accessibilityMAS violation, UIA issue; problems with accessibility standardsMAS violation, UIA issue; problems with accessibility standardsStatus: Open.#2884 In dotnet/winforms;Double-clicking the text in the custom webbrowser component that put into SplitContainer cannot be selected
🪲 bugProduct bug (most likely)Product bug (most likely)help wantedGood issue for external contributorsGood issue for external contributorsStatus: Open.#2910 In dotnet/winforms;Flaky tests:
GroupBoxTests.GroupBox_FlatStyle_SetWithCustomOldValueWithHandleWithVisualStyles_GetReturnsExpectedtest-bugProblem in test source code (most likely)Problem in test source code (most likely)Status: Open.#2856 In dotnet/winforms;MessageDecoder.MsgToString is missing several values defined in
WM_code cleanupcleanup code for unused apis/properties/comments - no functional changes.cleanup code for unused apis/properties/comments - no functional changes.help wantedGood issue for external contributorsGood issue for external contributorsStatus: Open.#2759 In dotnet/winforms;Run API Compat tool for .NET Framework 4.8 and .NET Core 3.1
enhancementProduct code improvement that does NOT require public API changes/additionsProduct code improvement that does NOT require public API changes/additionsStatus: Open.#3012 In dotnet/winforms;DataObject.GetData(FileContents) returns null
🪲 bugProduct bug (most likely)Product bug (most likely)area-ClipboardIssues related to ClipboardIssues related to ClipboardStatus: Open.#3026 In dotnet/winforms;The height of the "DropDown" list for the combobox control can't be reset default height after called the " comboBox1.Items.Clear();" method
🪲 bugProduct bug (most likely)Product bug (most likely)🚧 work in progressWork that is current in progressWork that is current in progresshelp wantedGood issue for external contributorsGood issue for external contributorsStatus: Open.#339 In dotnet/winforms;- Status: Open.#3106 In dotnet/winforms;
Touch Support
api-suggestion(1) Early API idea and discussion, it is NOT ready for implementation(1) Early API idea and discussion, it is NOT ready for implementationinvestigateItems we want to investigate before making a decision on an issueItems we want to investigate before making a decision on an issueStatus: Open.#2998 In dotnet/winforms;