/**
* ------------------------------------------------------ Undoes or Redoes this transaction. This
* method creates a new transaction and adds it to the system-wide queue of undoable transactions.
*
* @param arg Mi_UNDO_COMMAND_NAME or Mi_REDO_COMMAND_NAME
* ------------------------------------------------------
*/
public void processCommand(String arg) {
if (arg.equals(Mi_UNDO_COMMAND_NAME)) processCommand(clipBoard, newContents, false);
else processCommand(clipBoard, newContents, true);
}