Shape.UpdateAlignmentBox Method (Visio)
Updates the alignment box for a shape.
The UpdateAlignmentBox method alters the width and height of a shape, often a group. For example, after you move a shape in a group, the shape may be outside the group's alignment box. The UpdateAlignmentBox method updates the alignment box so that it encloses all the shapes in the group.
Many shapes are designed so that their alignment boxes don't coincide with their geometric extents. Using the UpdateAlignmentBox method on such shapes defeats the intentions of the shape designer.