private void toolStripButton_Config_Click(object sender, EventArgs e) { if (frmConfig == null || frmConfig.IsDisposed) { frmConfig = new FormConfig(); frmConfig.MdiParent = this; frmConfig.Width = CHILDFORM_WIDTH; frmConfig.Height = CHILDFORM_HEIGHT; } frmConfig.WindowState = FormWindowState.Maximized; frmConfig.Show(); frmConfig.Activate(); }