public void updateContentSelectionColor(final Color fillColor, final boolean isSelected) {
    final Color nodeSelectionColor = fillColor.darker();

    if (isSelected) {
      setSelectionColor(nodeSelectionColor.darker());
    } else {
      setSelectionColor(nodeSelectionColor);
    }
  }
Adds another line add the end of the label content.

@param line The line to add.
java/zylib/src/main/java/com/google/security/zynamics/zylib/gui/zygraph/realizers/ZyLabelContent.java