When you're customizing an existing dialog (through the Advanced Customizations in version 4.0, by creating a Dialog definition that's an "Add-on" to an existing base dialog), you may want to move, hide, or rename one of the controls that already exist on the base dialog. To do this, you need to know the ID's of the existing controls. We've added a reference of the ID numbers for the current version, so you don't need to get them form us or use a "Spy" program to find them.