/** The "default" button has been toggled */
  public void restoreDefaultVariables() {
    final EnvironmentVariable[][] libs = new EnvironmentVariable[][] {null};

    libs[0] = new EnvironmentVariable[0];
    if (libs != null) fEnvironmentVariablesContentProvider.setVariables(libs[0]);
    update();
  }
 /**
  * Initializes this control based on the settings in the given Interpreter install and type.
  *
  * @param Interpreter Interpreter or <code>null</code> if none
  * @param type type of Interpreter install
  */
 public void initializeFrom(IInterpreterInstall Interpreter, IInterpreterInstallType type) {
   fInterpreterInstall = Interpreter;
   fInterpreterInstallType = type;
   if (Interpreter != null) {
     fEnvironmentVariablesContentProvider.setVariables(
         getInterpreterInstall().getEnvironmentVariables());
   }
   update();
 }