//Onclick method for the XML uploading button
        private void XmlButton_Click(object sender, RoutedEventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();

            if (openFileDialog.ShowDialog() == true)
            {
                try
                {
                    _generalVM.LoadXMLFile(openFileDialog.FileName);
                }
                catch (Exception)
                {
                    XmlPathBox.Text = "Invalid XML file";
                    return;
                }

                XmlPathBox.Text = openFileDialog.FileName;

                _xmlUploded         = true;
                step2box.Background = Brushes.Green;
                enableContinueButton();
            }
        }