ui/src/main/java/ucar/util/prefs/ui/PrefPanel.java
public void addComponent(Component comp, int col, int row, String constraint) {
    layoutComponents.add( new LayoutComponent( comp, col, row, constraint));
  }
public void addComponent(Component comp, int col, int row, String constraint) {
    layoutComponents.add( new LayoutComponent( comp, col, row, constraint));
  }
Add a Component.