private void cmbPrice_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
var cmb = sender as ComboBox;
if (cmb.SelectedValue == null)
{
return;
}
var priceId = int.Parse(cmb.SelectedValue.ToString());
_returnPurchaseViewModel.SetPriceDetails(priceId, ReturnPurchaseDataGrid.SelectedIndex);
}
