protected void fileSaveXML() {
   JFileChooser chooser = null;
   if (currentFile == null) {
     chooser = new JFileChooser(startDirectory);
   } else {
     chooser = new JFileChooser(currentFile);
   }
   int returnVal = chooser.showSaveDialog(gw);
   if (returnVal == JFileChooser.APPROVE_OPTION) {
     currentFile = chooser.getSelectedFile();
     generalXML.saveGraph(currentFile);
   }
 }
 protected void fileSaveSimple() {
   JFileChooser chooser = null;
   if (currentFile == null) {
     chooser = new JFileChooser(startDirectory);
   } else {
     chooser = new JFileChooser(currentFile);
     if (!currentFile.isDirectory()) {
       chooser.setSelectedFile(currentFile);
     }
   }
   int returnVal = chooser.showSaveDialog(gw);
   if (returnVal == JFileChooser.APPROVE_OPTION) {
     currentFile = chooser.getSelectedFile();
     graph.saveSimple(currentFile);
   }
 }