Is there something different with the Windows 10 skin because it's not working well with the 3rd party edit control (see attachment). Every other skin is working perfectly.
I did fix the problem. It was caused by setting the editor's Visible property from False to True when creating a frame for a tab sheet. Not sure why it didn't work with the Windows 10 skin but now it works. 🙂
This can be closed. The reason for this was an unnecessary set of tab sheet's SkinData.SkinSection when a tab sheet was created. After removing it everything works like it should. 🙂