Use client extension points in client-side UI scripting to modify forms, so that you do not have to directly modify the form. By using client extension points, you can integrate customizations without actually altering the core components in the application code.

You create client extension points and add them to the UI scripts in the base application code. When customizing a base application, implement the client extension points by creating the custom UI scripts and registering them against the client extension points.
Note: You create and register the client extension points in a manner that is similar to how you implement the scripted and UI extension points. For a detailed example of a scripted extension point, and to learn more about this process, see Using extension points to extend application functionality and Using UI extension points in server-side UI macros.