private void set_define_events()
{
m_cmd_exit.Click += new EventHandler(m_cmd_exit_Click);
m_cmd_insert.Click += new EventHandler(m_cmd_insert_Click);
m_cmd_update.Click += new EventHandler(m_cmd_update_Click);
m_cmd_delete.Click += new EventHandler(m_cmd_delete_Click);
this.KeyDown +=new KeyEventHandler(f999_ht_nguoi_su_dung_KeyDown);
m_fg.DoubleClick += new EventHandler(m_fg_DoubleClick);
}