Defines an output field that can be grouped. Groupable classes will extend this class.
Inheritance: BasicOutputField
 /// <summary>
 /// Add a field to this group.
 /// </summary>
 /// <param name="field">The field to add to the group.</param>
 public void AddField(OutputFieldGrouped field)
 {
     this.fields.Add(field);
 }
 /// <summary>
 /// Add a field to this group.
 /// </summary>
 /// <param name="field">The field to add to the group.</param>
 public void AddField(OutputFieldGrouped field)
 {
     this.fields.Add(field);
 }