The Bubble graph or series is used to represent data as bubbles. It has three mandatory
series components, Position, Value
and Radius. The positions of the bubbles are determined by the data in
the first two components while the radii of the bubbles are determined by the
data in the last component. It also has an optional series component called LabelMember
whose data may be used as the mark labels for the bubbles.
It is important to note that if the Isometric property is set to True,
the bubbles will always be drawn isometrically using the scale of the vertical