Repro for dotnet/wpf#1167
If you edit MainWindow.xaml and set Expander property IsExpanded=true, you'll see the validation adorner properly rendered.
However, if it is set to false, then the validation adorner is not visible.
Repro for dotnet/wpf#1167
If you edit MainWindow.xaml and set Expander property IsExpanded=true, you'll see the validation adorner properly rendered.
However, if it is set to false, then the validation adorner is not visible.