Tutorial: When to use

The following describes when to use Custom controls, Page Modules, or HTML Items.

To provide your own user interface for a prompt-like control that reads and sets parameters
To provide your own user interface for page navigation buttons (Next, Finish, ...)
To provide your own user interface for authored data such as a list or visualization

To set the initial state of prompt controls
To set prompt control custom validation functions
To read current selections from a prompt control (possibly to store) before going to the next page
Code (using HTML Item) from a previous release that was executed globally on the page will likely move into the load method