/*.................................................................................................................*/
 public void addOptions(ExtensibleDialog dialog) {
   stateFreqField = new DoubleField[getNumStates()];
   for (int i = 0; i < getNumStates(); i++) {
     stateFreqField[i] =
         dialog.addDoubleField(
             "" + CategoricalData.getDefaultStateSymbol(dataClass(), i) + ":",
             getStateFreq(i),
             10);
   }
   Panel moreButtons = new Panel();
   dialog.addAListenedButton("Equal", moreButtons, this);
   dialog.addAListenedButton("Norm+-", moreButtons, this);
   dialog.addAListenedButton("Norm*/", moreButtons, this);
   dialog.addNewDialogPanel(moreButtons);
 }