private void btnUser_Click(object sender, EventArgs e)
        {
            SidePanel.Height = btnUser.Height;
            SidePanel.Top    = btnUser.Top;
            var myControl = new UserControlAccueil();

            panelContainer.Controls.Clear();
            panelContainer.Controls.Add(myControl);
        }
        private void FormPrincipal_Load(object sender, EventArgs e)
        {
            this.Location    = new Point(150, 40);
            SidePanel.Height = btnHome.Height;
            SidePanel.Top    = btnHome.Top;
            var myControl = new UserControlAccueil();

            panelContainer.Controls.Clear();
            panelContainer.Controls.Add(myControl);
        }