5.7 Popup Control Usage Considerations

In WPF, the Popup control only operates correctly when the WPF Application has focus. When focus moves to another application, the Popup may not display or function properly.

5.7.1 Focus Management Pattern

When using the Popup control in WPF, you must forcibly acquire focus through the PreviewMouseDown event.

Project Structure

The templates folder contains a WPF project example (use latest .NET per version mapping).

templates/
└── WpfPopupSample.App/                  ← WPF Application
    ├── Views/
    │   ├── MainWindow.xaml
    │   └── MainWindow.xaml.cs           ← Focus management pattern implementation
    ├── App.xaml