code: public CommandLine setColorScheme(Help.ColorScheme colorScheme) {
          this.colorScheme = Assert.notNull(colorScheme, "colorScheme");
          for (CommandLine sub : getSubcommands().values()) { sub.setColorScheme(colorScheme); }
          return this;
      }
docs: Sets the color scheme to use when printing help.
  @param colorScheme the new color scheme
  @see #execute(String...)
  @see #usage(PrintStream)
  @see #usage(PrintWriter)
  @see #getUsageMessage()
  @since 4.0