private void AADevCheckerToolStripMenuItem_Click(object sender, EventArgs e) { CloseAllChildForm(); AADevEnvChecker aaDevEnvChecker = new AADevEnvChecker(); aaDevEnvChecker.WindowState = FormWindowState.Maximized; aaDevEnvChecker.MdiParent = this; aaDevEnvChecker.MaximizeBox = false; aaDevEnvChecker.MinimizeBox = false; aaDevEnvChecker.Show(); }