void mi_Click(object sender, RoutedEventArgs e)
 {
     MenuItem mi = sender as MenuItem;
     ContextMenu cm = mi.Parent as ContextMenu;
     DataGridCell curCell = (DataGridCell)cm.PlacementTarget;
     string colName = (string)curCell.Column.Header;
     MenuDays md = (MenuDays)curCell.DataContext;
     ChoseMealView mbv = new ChoseMealView(md, viewModelMain.Id, colName);
     mbv.ShowDialog();
     viewModelMain = new MainViewModel(sel, selList);
     this.DataContext = viewModelMain;
 }
 void do_Click(object sender, MouseButtonEventArgs e)
 {
     DataGrid mi = sender as DataGrid;
     DataGridCellInfo curCell=(DataGridCellInfo)mi.CurrentCell;
     string colName = (string)curCell.Column.Header;
     if (!colName.Equals("День"))
     {
         MenuDays md = (MenuDays)curCell.Item;
         ChoseMealView mbv = new ChoseMealView(md, viewModelMain.Id, colName);
         mbv.ShowDialog();
         viewModelMain = new MainViewModel(sel, selList);
         this.DataContext = viewModelMain;
     }
 }