LOCK_VP_DRAWLIST locks the drawlist of a specified viewport.
---->(LOCK_VP_DRAWLIST)---|viewport|---->
By default new workplanes, parts, and so on are added to the drawlist of each viewport. By locking the drawlist, you prevent this addition of new elements.
It is not possible to add items, remove items, clear, or replace the drawlist by copying when the drawlist of a viewport is locked.
LOCK_VP_DRAWLIST "vport1"
All viewport names must be enclosed by double quotes (" ").