private void button2_Click(object sender, EventArgs e) { if (MainTreeview.CheckIfAllCupboardAreVerified()) { CustomerView = new CreateCustomer(DataBase, this); CustomerView.Dock = DockStyle.Fill; splitContainer1.Panel2.Controls.Add(CustomerView); CustomerView.BringToFront(); } else { CustomPopup obj = new CustomPopup("Please check each cupboard before confirming your order"); obj.Show(this); } }