[Dark Mode] Different Icon Display for Expanding Nodes with Child Items in TreeView
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- C#
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Description
### .NET version
9.0.0-rc.1.24414.1 + build private dll from winforms repo main branch
### Did it work in .NET Framework?
No
### Did it work in any of the earlier releases of .NET Core or .NET 5+?
This is a new feature Dark Mode: https://github.com/dotnet/winforms/pull/11857
### Issue description
The icon for expanding nodes with child items in TreeView appears differently in Dark Mode compared to Classic. Please confirm if this is the expected behavior. Below are the results in Classic and Dark Mode
**Classic**
**Dark Mode**
### Steps to reproduce
1. Create a WinForms .NET Core application with TreeView control.
2. Populate the TreeView with a parent node that contains several child nodes.
3. Enable DarkMode by Application.SetColorMode(SystemColorMode.Dark) in Program.cs file.
4. Run the application.
5. Observe the expand icon
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Assessment
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