Windows Forms NumericUpDown control up/down buttons black when ApplicationVisualStyles is false

[DanLBarr]

Description

A simple Windows Forms application using .NET 10 with an NumericUpDown control on the form and ApplicationVisualStyles set to false, displays the up/down buttons of the NumericUpDown control as black.

Reproduction Steps

Create a Windows Forms project using .NET 10 in Visual Studio 2026. Add a NumericUpDown control to the form. Add ApplicationVisualStyles false (using the appropriate ApplicationVisualStyles XML tag) in the .csproj file. Run the program and you will see that the up/down buttons are black.

Expected behavior

I would expect that the up/down buttons of the NumericUpDown control would be the normal gray color.

Actual behavior

The up/down buttons of the NumericUpDown control are black.

Regression?

In .NET 9 and earlier, the NumericUpDown buttons were gray when ApplicationVisualStyles was false.

Known Workarounds

Set ApplicationVisualStyles to true. However, this is not always an acceptable workaround.

Configuration

Microsoft.NETCore.App 10.0.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

Windows 11 Pro
version 25H2
build 26200.8655
Windows Feature Experience Pack 1000.26100.315.0

Other information

In the NumericUpDown control code.

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