private void OpenObjectPlacementEditor() { if (objectPlacementEditorToolStripMenuItem.Checked) { objectPlacementEditor.Focus(); return; // dont open a second one } objectPlacementEditor = new ObjectPlacementEditorWindow(); objectPlacementEditor.FormClosed += new FormClosedEventHandler(OnObjectPlacementEditorClose); objectPlacementEditorToolStripMenuItem.Checked = true; objectPlacementEditor.Show(); }