code: public void setFont(String header_font_family, int header_font_size,
              String details_font_family, int details_font_size) {
          this.headerLabel
                  .setStyle("-fx-font-family: \"" + header_font_family + "\";"
                          + "-fx-font-size:" + Integer.toString(header_font_size) + "px;");
          this.detailsLabel
                  .setStyle("-fx-font-family: \"" + details_font_family + "\";"
                          + "-fx-font-size:" + Integer.toString(details_font_size) + "px;");
      }
docs: Sets the font sizes and the font families for the header and details
  label.
  
  @param header_font_family The header font family in <code>Strings</code>
  @param header_font_size The header font size in pixels
  @param details_font_family The details font family in
  <code>Strings</code>
  @param details_font_size The details font size in pixels