ui/src/main/java/ucar/util/prefs/ui/PrefPanel.java
public void addHeading(String heading, int row) {
    layoutComponents.add( new LayoutComponent( heading, 0, row, null));
  }
public void addHeading(String heading, int row) {
    layoutComponents.add( new LayoutComponent( heading, 0, row, null));
  }
Add a heading at the specified row. this spans all columns