private void BtnEdit_Click(object sender, RoutedEventArgs e)
        {
            int pos = DataGrid.SelectedIndex;

            if (pos == -1)
            {
                MessageBox.Show("Seleccione un avituallamiento", "Error");
                return;
            }
            Supply supply;

            try
            {
                supply = (Supply)DataGrid.SelectedItem;
            }
            catch (InvalidCastException)
            {
                return;
            }
            SupplyForm window = new SupplyForm(supply.DeepClone(), pos);

            window.ShowDialog();
        }
        private void BtnAdd_Click(object sender, RoutedEventArgs e)
        {
            SupplyForm window = new SupplyForm();

            window.ShowDialog();
        }