On the sheet, the cells of both corners and the offsets into them; an absolute anchor
states tl as a position and br as a size, with no cells. A member of a group is always
the latter, in the group's child space (IGroup.JSON.childBounds).
OptionalanchorThe behavior of how the movable resizes as the anchor/cells change.
The content of the movable object.
OptionalflipMirrored left to right within the frame.
OptionalflipMirrored top to bottom within the frame.
OptionalhiddenIf true then the movable object is hidden.
OptionallockWhether resizing should keep the aspect ratio.
Optionallockslock specific fields
OptionalnoIf true then the movable is left out when the sheet is printed.
OptionalrotationThe rotation in degrees.
OptionalunlockedIf true then the movable can still be selected and edited while the sheet is protected.
The anchor for the movable object.