Section to draw inside, replacing nothing. Empty means the panel goes at Slot.
Keeps a panel that is off, off, rather than saving it as a draft. Only an edit of a panel that is off offers it, and it is false whenever ActivateNow is true.
Entity field names to stand in for, all inside ReplaceFieldSectionKey.
Section whose fields the field mode chooses from.
Key of the rail tab to stand in for, when the mode is rail-tab.
Sections to stand in for, when the section mode names more than one. Empty means the
one in ReplaceSectionKey.
Where inside its section the panel draws: for InSectionKey and for a field claim.
Order among the panels in the same position, higher first. Null leaves it unset: a new panel saves 0, and an edited one keeps the order it has.
The editable answers. One field per control in the dialog.