Sony DCR-TRV39 - Manual (Page 154)

5-4-2 Object Operations
Changing the overlap order of objects
When new objects are added to the layout, they will appear on top of
previously placed objects.
Select the object for which you would like to change the overlap
order, and click the [Change Overlap Order] button.
A dropdown menu will be displayed. Select the object's new position.
Bring to front
Moves the selected object to the front of all the overlapping
objects.
Bring forward Moves the selected object forward one level.
Bring backward Moves the selected object backward one level.