# Card File - Examples of Creating an Application

Card File is an extended example that highlights the application construction features of the GUI builder. It also shows you how to create your own component with GUI builder, how to add it to the GUI palette, and how to use that component with the card file application created earlier.

Making Your Own Card File | Create an interface for a simple, standalone application called card file.
Adding Behavior to the Card File | Add operations (callbacks) to the components in the card file interface.
Adding a Mail Dialog, Part 1 | Create a mail panel component with its own set of operations.
Adding a Mail Dialog, Part 2 | Import the mail panel component to the GUI builder palette, make a dialog box containing the new component, and call the mail dialog from the card file.