private void btnAdd_Click(object sender, EventArgs e)
        {
            try
            {
                frmIns_AlternateMissions afrmIns_AlternateMissions = new frmIns_AlternateMissions(this);
                afrmIns_AlternateMissions.ShowDialog();
            }
            catch (Exception ex)
            {
                MessageBox.Show("frmLst_AlternateMissions.btnAdd_Click\n" + ex.ToString(), "Error ", MessageBoxButtons.OK, MessageBoxIcon.Error);

            }
        }
 private void btnInsAlternateMissions_ItemClick(object sender, ItemClickEventArgs e)
 {
     try
     {
         frmIns_AlternateMissions afrmIns_AlternateMissions = new frmIns_AlternateMissions();
         afrmIns_AlternateMissions.Show();
     }
     catch (Exception ex)
     {
         MessageBox.Show("frmMain.btnInsAlternateMissions_ItemClick\n" + ex.ToString(), "Lỗi", MessageBoxButtons.OK, MessageBoxIcon.Error);
     }
 }