public void setStyleClass(String styleClass) {
        this.styleClass = styleClass;
    }
The type of the item. Can be 'box' (default), 'point', 'range', or 'background'.
<p>
Types 'box' and 'point' need a start date, the types 'range' and 'background' needs both a start and end date.
primefaces/src/main/java/org/primefaces/model/timeline/TimelineEvent.java