property Group.Left as Long
Specifies the distance between the left edge of the control and group's list.

TypeDescription
Long A long expression that specifies the distance between the left edge of the control and group's list

The Left, Top, Width and Height properties determines the location of the group's list in client coordinates. 

Use the LayoutChanged event and Left, Top, Width and Height to determine the coordinates of the group's list on the fly.