The field lock controls the lock state of a calculated field. When the
field is unlocked, the value is recalculated if related fields are changed.
If locked, the value is not recalculated and the user can enter a value
in the field.
To Add a Field Lock:
Click Field Lock and drag it to the workspace.
Click the ControlToLock
property and select the control ID of the field with which to associate
the lock.
