public ownContextMenu(MainWindow mainWindow) {
				this.mainWindow = mainWindow;

				MenuItem m = new MenuItem();
				m.Header = "Del";
				m.Click += m_Click;
				this.Items.Add(m);
			}
			public LvGroupMatterContextMenu(MainWindow mainWindow) {
				this.mainWindow = mainWindow;

				MenuItem m = new MenuItem();
				m.Header = "Check Comment";
				m.Click += checkComment_Click;
				this.Items.Add(m);

				m = new MenuItem();
				m.Header = "Add";
				m.Click += add_Click;
				this.Items.Add(m);

				m = new MenuItem();
				m.Header = "Modify";
				m.Click += mod_Click;
				this.Items.Add(m);

				m = new MenuItem();
				m.Header = "Del";
				m.Click += del_Click;
				this.Items.Add(m);
			}