private void pictureBox7_Click(object sender, EventArgs e) { try { Home.Home_pnl.Visible = false; AddBill _AddBill = new AddBill(); _AddBill.MdiParent = this; _AddBill.WindowState = FormWindowState.Maximized; _AddBill.Show(); _AddBill.Focus(); } catch (Exception ex) { notifyIcon1.ShowBalloonTip(1000, this.Name, ex.Message, ToolTipIcon.Info); ; } }