The Volume graph or series is usually used to display trading volumes of a stock over
a period of time as a set of vertical lines. It has two mandatory
series components, Position
and Volume. The data in these two components respectively specify the
positions of heights of the vertical lines. It also has an optional series
component called LabelMember whose data may be used as the mark labels
for the lines.
The UseOrigin property controls whether to use the Origin property
to determine the baseline position of the lines. If it is set to false, the
origin of the vertical axis is used as the baseline position of the lines.