docs: public static String getPinButtonStyle() {
          final StringBuilder pinStyle = new StringBuilder(ValoTheme.BUTTON_BORDERLESS_COLORED);
          pinStyle.append(' ');
          pinStyle.append(ValoTheme.BUTTON_SMALL);
          pinStyle.append(' ');
          pinStyle.append(ValoTheme.BUTTON_ICON_ONLY);
          pinStyle.append(' ');
          pinStyle.append("pin-icon");
          return pinStyle.toString();
      }