private void add_ToolStripButton_Click(object sender, EventArgs e)
        {
            User user = new User();

            if (EditEntry(user) == DialogResult.OK)
            {
                _context.AddToUsers(user);
                _users.Add(user);

                int index = user_RadGridView.Rows.Count - 1;

                user_RadGridView.Rows[index].IsSelected = true;

                //In case if you want to scroll down as well.
                user_RadGridView.TableElement.ScrollToRow(index);
            }
        }