private void ScanTextBox_KeyUp(object sender, System.Windows.Input.KeyEventArgs e) // Method what adds new OperationItem in "Operation" Tab on "Enter" button click
{
if (e.Key != System.Windows.Input.Key.Enter)
{
return;
}
e.Handled = true;
_viewModel.AddNewOperationItem();
_viewModel.CaltulateSum();
}