private void perspectiveToolStripMenuItem_CheckedChanged(object sender, EventArgs e) { if (_updating) { return; } _updating = true; if (perspectiveToolStripMenuItem.Checked) { ModelPanel.SetProjectionType(false); orthographicToolStripMenuItem.Checked = false; } else { ModelPanel.SetProjectionType(true); orthographicToolStripMenuItem.Checked = true; } _updating = false; }