void (ContentEntryEditor newEditor) { PyContentEntriesEditor.MyContentEntryEditor existingEditor = getContentEntryEditor(); if (Comparing.equal(existingEditor, newEditor)) { return; } if (existingEditor != null) { existingEditor.removeListener(myListener); } if (newEditor != null) { ((PyContentEntriesEditor.MyContentEntryEditor)newEditor).addListener(myListener); } super.setContentEntryEditor(newEditor); }