private void btnCross_Click(object sender, EventArgs e)
{
btnNew.PerformClick();
this.Visible = false;
SalesmanManager m = new SalesmanManager();
m.Visible = true;
}
private void pbSalesmen_Click(object sender, EventArgs e)
{
pnlMain.Controls.Clear();
SalesmanManager salm = new SalesmanManager();
salm.TopLevel = false;
salm.Dock = DockStyle.Fill;
salm.FormBorderStyle = FormBorderStyle.None;
pnlMain.Controls.Add(salm);
salm.Show();
}