This is easy to reproduce:
- Create an empty 5.7.1 project
- Create a user widget and add a Text Box
- In the PreConstruct event, call TextBox.SetStyle and give it any style. It can be an empty one or one that’s fully built out.
- Compile and go to design view
- Instant crash.
Has anyone found a workaround for this? It’s preventing us from upgrading our UI-heavy application.
Thanks!

