O carregamento de designer visual foi cancelado
When you open a XAML file in the WPF Designer for Visual Studio, you can cancel the action by pressing the ESC key. When you cancel loading, the following message appears in the WPF Designer:
Load Cancelled
Loading of the visual designer was cancelled.
Resume loading the designer
You can click Resume loading the designer to continue loading the designer.
Consulte também
Conceitos
Outros recursos
Depuração e interpretando erros no criador de WPF