private void btnStaff_Click(object sender, EventArgs e)
{
ListStaff f = new ListStaff();
panelLoadData.Controls.Add(f);
f.BringToFront();
}
private void buttonStaff_Click(object sender, EventArgs e)
{
//LoadData lên form
ListStaff f = new ListStaff();
this.panelLoadData.Controls.Add(f);
f.BringToFront();
//button trả về màu cũ khi qua button khác
buttonFood.BackColor = Color.FromArgb(5, 199, 242);
buttonHome.BackColor = Color.FromArgb(5, 199, 242);
buttonTable.BackColor = Color.FromArgb(5, 199, 242);
buttonBill.BackColor = Color.FromArgb(5, 199, 242);
}