Pop-up dialogs are very common in Windows applications. There are built-in dialogs you can display from WPF. You will learn to call each of the standard dialogs to display messages and ask the users a question like “Yes” or “No”. The standard dialogs don’t look that great when put against a nicely styled WPF application. You will learn to create your own dialog window that you can style and add any kind of message and buttons you want.