private void set_define_events()
{
this.Load += F109_dm_thue_de_Load;
m_cmd_save.Click += m_cmd_save_Click;
m_cmd_exit.Click += m_cmd_exit_Click;
this.KeyDown += F109_dm_thue_de_KeyDown;
m_txt_chan_duoi.Leave += m_txt_chan_duoi_Leave;
m_txt_chan_tren.Leave += m_txt_chan_tren_Leave;
m_txt_bu_tru.Leave += m_txt_bu_tru_Leave;
}