To add the TabControl manually in XAML, follow these steps: Create a new WPF project in Visual Studio. To add the TabControl control manually in C#, follow these steps: Create a new WPF application ...
To reproduce this bug, create a Winform app (tested in .NET 8), add an Elementhost (add from code behind since it is not in the Toolbox anymore...) and host a WPF UserControl which contains a ...