After clearing the Use simple failure rate instead of failure modes checkbox in a reliability element dialog, clicking on the Switch to failure modes page hyperlink or on the Failure Modes tab displays the Failure Modes tab:
Note: If a non-zero
Failure Rate was defined in the main dialog prior to activating the
Failure Modes tab, this failure mode is automatically converted into the
first failure mode in the Failure Modes tab.
Warning: If, after
defining one or more failure modes, you subsequently check the Use simple
failure rate instead of failure modes checkbox on the main dialog, all
failure modes are permanently deleted.