public void AddGroup(string fieldName)
{
Group gr = new Group { GroupingFieldName = fieldName };
Groups.Add (gr);
GroupHeaderSection gh = new GroupHeaderSection { Name = "Group header " + gr.GroupingFieldName, Size = new Model.Size (Width, 20), Location = new Point (0, 150) };
GroupHeaderSections.Add (gh);
GroupFooterSection gf = new GroupFooterSection { Name = "Group footer " + gr.GroupingFieldName, Size = new Model.Size (Width, 20), Location = new Point (0, 250) };
GroupFooterSections.Add (gf);
}