Never change the provided APEX resources

You should never change the original provided APEX resources like Themes, Templates, graphical files, the JavaScript, and CSS provided libraries. Always create duplicates of the provided resources and work on them.

Themes and Templates

APEX allows you to easily duplicate any Theme or Template. Use it to create your own modified resources.

Every major version upgrade of APEX includes an updated Images directory, which must be copied to run over the existing one as part of the post upgrade procedure. This means changes that you have made to the APEX-provided resources in the old version will not be there for the new version and you will have to repeat them. Creating your own resources, based on the provided ones, can prevent that.

Note

The APEX upgrade process does not change the application Theme and Templates of existing applications. This means that the existing applications will continue to use the Theme and Templates from the old version. In some cases...