WPF and Win32 interop: 'Airspace' issue

If you've ever had to host any WinForms forms inside a WPF project, you might know about the 'Airspace' problem. Basically, the WinForms control must always be on top. It would be great if you consider to solve the 'Airspace' issue

https://docs.microsoft.com/en-us/dotnet/framework/wpf/advanced/wpf-and-win32-interoperation
https://docs.microsoft.com/en-us/dotnet/framework/wpf/advanced/technology-regions-overview