Final answer:
The startup sequence of window events in a WPF application includes the Startup, Loaded, LayoutUpdated, and Activated events which correspond to the application's initialization, content loading, visual tree layout processing, and window activation stages respectively.
Step-by-step explanation:
WPF Application Window Events at Startup
The series of window events during the startup of a WPF application typically follows this order: Startup, Loaded, LayoutUpdated, and Activated. Initially, the Startup event is triggered when the application begins running. Soon after, the Main Window fires the Loaded event once the content is fully loaded and rendered. Then LayoutUpdated occurs when the layout of the visual tree is processed, which may happen multiple times. Finally, the Activated event marks the window as active and ready to interact with the user. Understanding these events can help in customizing the behavior of an application upon launch.