public void setDraggable(Boolean draggable) {
        this.draggable = draggable;
    }
@param draggable Whether the event should be draggable. Setting
{@code null} means that the default of the schedule is applied.
Otherwise, this setting overrides the default of the schedule.
primefaces/src/main/java/org/primefaces/model/DefaultScheduleEvent.java