Customizing the metamodel : Diagrams: Creating and modifying : Creating roadmap-style diagrams : Diagram : How is a Milestone symbol shown?
  
How is a Milestone symbol shown?
A Milestone symbol is shown as a colored piechart-style icon that indicates the maturity of the Project in terms of up to eight segments. The Segments are colored indicating the status of a particular Line Of Development.
A maximum of eight segments will be supported, associated with pre-defined properties in the Milestone definition. The number of properties dictates the number of segments.
Every property that represents a list selection of color values that is found in the milestone symbol is taken as a milestone segment property.
Milestone segments are drawn clockwise in property order.
The value of the property and the color defined for the list value in the property set determines the fill color used.
A list, for example LoD Segment Status, will determine the status of segments.
The default value will be Not required.