Read-Write
SaveBackExt As Variant
Sets or returns the attached drawing's save-back extents as an array of four Doubles.
Coordinates are returned in the following order: MinX, MinY, MaxX, MaxY. Objects in the save set that are associated with the attached drawing are saved back only if they are within or crossing the save-back extents boundary. (MinX, MinY) is the lower-left corner, and (MaxX, MaxY) is the upper right.
The attached drawing must be active when you use this property.