private void Button_Add_Click(object sender, RoutedEventArgs e)
{
int number = MyData.Items.Count;
if (CDataGridList == null)
{
CDataGridList = new ObservableCollection <CDataGrid>();
MyData.ItemsSource = CDataGridList;
MyData.CanUserAddRows = false;
}
CDataGridList.Add(new CDataGrid()
{
Numeration = number, Category = Category.Scheta, Date = DateTime.UtcNow
});
number++;
}