MARKUS

                gridViewMarkup.ItemsSource = ViewerDataModel.Instance._markupInfoList;

                SetCommentPages();

                /// create a group descriptor

                gridViewMarkup.GroupDescriptors.Clear();

                GroupDescriptor descriptor = new GroupDescriptor();

                descriptor.DisplayContent = "DEPT";

                //descriptor.SortDirection = ListSortDirection.Ascending;

                gridViewMarkup.GroupDescriptors.Add(descriptor);

                GridViewMarkup_Sorting(gridViewMarkup,new GridViewSortingEventArgs(gridViewMarkup.Columns[0],SortingState.None,SortingState.None));

                List<MarkupInfoItem> gridItem = gridViewMarkup.Items.Cast<MarkupInfoItem>().ToList(); //전체 마크업

                List<MarkupInfoItem> gridSelectionItem = gridViewMarkup.SelectedItems.Cast<MarkupInfoItem>().ToList(); //선택 된 마크업

                List<MarkupInfoItem> gridNonSelectionItem = gridItem.Except(gridSelectionItem).ToList(); //선택 되지 않은 마크업

                if (e.AddedItems.Count() > 0 && this.pageNavigator.CurrentPage != null)

                {

                    foreach (var item in gridSelectionItem)

                        }

                    }

                }

                else if (e.RemovedItems.Count > 0)

                {

                    var _infoItem = e.RemovedItems.Cast<MarkupInfoItem>().ToList();

                        });

                    }

                }

            }

        }