I use Shape.BoundingBox regularly to get the boundingbox of a shape with its data graphics:
https://docs.microsoft.com/en-us/office/vba/api/visio.shape.boundingboxwith this flag:
visBBoxIncludeDataGraphics &H10000 Includes data-graphic callout shapes (and their sub-shapes) that are applied to the shape. Off by default.
Is it also possible to read this information from the shapesheet?
Use case: I want to know the size of the shape with its data graphics included.