private void frmSett3D_FormClosed(object sender, FormClosedEventArgs e) { frmSett3D = null; }
private void additionallyToolStripMenuItem_Click(object sender, EventArgs e) { //вызов 3Д формы //покажем графические настройки if (frmSett3D == null) { frmSett3D = new Sett3D(); frmSett3D.FormClosed += new FormClosedEventHandler(frmSett3D_FormClosed); frmSett3D.Show(); } else { frmSett3D.Show(); } }