Worked on AvaloniaUI/Avalonia, focusing on enhancing password field usability and improving UI control reliability. Developed a feature allowing users to copy and cut revealed passwords, treating them as standard text and updating command states and selection logic to ensure intuitive behavior. Added unit tests to verify correct operation when toggling password reveal, strengthening test coverage. Addressed a critical naming inconsistency in the ToggleSwitch control by correcting the content presenter registration, aligning with established conventions to reduce misregistration risk. Utilized C#, AvaloniaUI, and unit testing frameworks to deliver these improvements, resulting in a more robust and maintainable UI framework.