code: public void addNavButtons()
      {
          new SCannedBox(this.getNextLocation(ScreenConstants.FIRST_SCREEN_LOCATION, ScreenConstants.SET_ANCHOR), this, null, ScreenConstants.DEFAULT_DISPLAY, null, null, JCalendarPopup.CALENDAR_ICON, ProjectTask.PROJECT_TASK_CALENDAR_SCREEN, ProjectTask.PROJECT_TASK_CALENDAR_SCREEN);
          new SCannedBox(this.getNextLocation(ScreenConstants.FIRST_SCREEN_LOCATION, ScreenConstants.SET_ANCHOR), this, null, ScreenConstants.DEFAULT_DISPLAY, null, null, MenuConstants.FORMDETAIL, ProjectTask.PROJECT_PREDECESSOR_DETAIL_SCREEN, ProjectTask.PROJECT_PREDECESSOR_DETAIL_SCREEN);
          super.addNavButtons();
      }
docs: Add the navigation button(s) to the left of the grid row.