private void btnSave_Click(object sender, EventArgs e)
        {
            string type   = cmbType.SelectedItem.ToString();
            string prefix = txtPrefix.Text.Trim();
            string name   = txtName.Text.Trim();

            if (string.IsNullOrEmpty(name))
            {
                MessageBox.Show("Name cannot be empty.", "Cannot Save Functiond Id", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                txtName.Focus();
                return;
            }

            if (string.IsNullOrEmpty(prefix))
            {
                MessageBox.Show("Prefix cannot be empty.", "Cannot Save Functiond Id", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                txtPrefix.Focus();
                return;
            }

            if (this.Model.FunctionalIds.FunctionalId.Any(functionalId => functionalId.Name == name))
            {
                MessageBox.Show($"Name \"{name}\" already exists.", "Cannot Save Functiond Id", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                txtName.Focus();
                return;
            }

            if (this.Model.FunctionalIds.FunctionalId.Any(functionalId => functionalId.Value == prefix))
            {
                MessageBox.Show($"Prefix \"{prefix}\" already exists.", "Cannot Save Functiond Id", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                txtPrefix.Focus();
                return;
            }

            FunctionalId funcId = new FunctionalId(Model);

            funcId.Type  = type;
            funcId.Value = prefix;
            funcId.Name  = name;
            funcId.Guid  = Model.GenerateGuid(name).ToString();

            this.Model.FunctionalIds.FunctionalId.Add(funcId);
            string displayName = string.Concat(string.Concat(name, " - "), prefix);

            ParentControl.RefreshEntity();
            ParentControl.FunctionalIdComboBox.SelectedIndex = ParentControl.FunctionalIdComboBox.FindStringExact(displayName);
            this.Close();

            MessageBox.Show("Functional Id saved in memory.", "Saved", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }