private void btnCommercial_Click(object sender, EventArgs e)
{
//lancer form Commercial
Form_Commercial f2 = new Form_Commercial();
f2.Show();
}
private void commercialToolStripMenuItem2BBBB_Click(object sender, EventArgs e)
{
Form_Commercial f3 = new Form_Commercial();
f3.TopLevel = false;
this.panel1.Controls.Add(f3);
f3.FormBorderStyle = FormBorderStyle.None;
f3.Top = 0;
f3.Left = 0;
f3.Size = f3.ClientSize;
f3.Dock = DockStyle.Fill;
f3.BringToFront();
f3.Show();
this.Text = "Commercial";
}