private void mnNVXemLichDay_Click(object sender, EventArgs e)
{
frmLichDay frm = new frmLichDay();
ShowPNMain(frm);
}
//--------------------------------------------------------------------------------------//
#region GiangVien
//XemLichDay
private void mnLichDay_Click(object sender, EventArgs e)
{
frmLichDay frm = new frmLichDay((eGiangVien)tk);
ShowPNMain(frm);
}