Developing Zed's user interface using Rust presented unique challenges due to Rust's strict ownership system, which contrasts sharply with the more flexible paradigms of other languages like JavaScript. This strict system necessitated a reevaluation of traditional GUI design patterns, as typical practices such as attaching event listeners were not straightforward in Rust's environment. The creators of Zed addressed these challenges by developing a custom UI framework called GPUI, which organizes all application data under a single top-level object known as the AppContext. This structure enables dynamic UI elements, like modal dialogs, to interact with the application while maintaining the strict ownership rules of Rust. GPUI allows entities to emit and observe events without reentrancy issues by employing a queue-based effect system that aligns well with Rust's safety principles. This design not only managed state effectively but also avoided complex data structures and excessive use of macros. The framework's architecture allows for efficient state management and event handling, paving the way for future developments in Zed's user interface capabilities.