1. A form user interface modification system for use in customizing forms of an application, the form user interface modification system comprising: a processor of a computer; an export component, implemented at least in part on the processor of the computer, which retrieves a first binary format form for customization from a form database, wherein the export component generates a first extensible markup language (XML) format form by converting the first binary format form into XML format; and an import component, implemented at least in part on the processor of the computer, which receives a customized XML format form creating using the first XML format form, wherein the import component stores the customized XML format form as an XML layer that includes XML code indicative of differences between the customized XML format form and the first XML format form, wherein the XML layer is stored in the form database with a reference to the associated first binary format form stored in the form database that was used to generate the first XML format form.