private void DriverItem_Click(object sender, EventArgs e) { if (ManageDriverPage == null) { return; } if (!IsInTab(ManageDriverPage.Text)) { driverInfo = new DriverInfo(); driverInfo.TopLevel = false; driverInfo.Parent = this.ManageDriverPage; driverInfo.Show(); MainTab.TabPages.Add(ManageDriverPage); } MainTab.SelectedTab = ManageDriverPage; }