The standard record edit page does not allow customization outside the layout of fields. Editing records with Visualforce pages allows customization of all aspects of the page, including styling, content, and displayed buttons.
In this recipe, we will create a Visualforce page that provides contact edit capability, but does not allow a contact to be reparented to a different account. The account lookup field is editable until the record is saved with the lookup populated, after which it becomes read-only. This page will also render a different section heading depending on whether the contact is being created or edited.
This recipe makes use of a standard controller, so we only need to create the Visualforce page.
