code: public void setLabelInfo(CommandButtonLabelInfo labelInfo) {
          if (labelInfo == null) {
              labelInfo = CommandButtonLabelInfo.BLANK_BUTTON_LABEL;
          }
          CommandButtonLabelInfo old = this.labelInfo;
          this.labelInfo = labelInfo;
          firePropertyChange(LABEL_INFO_PROPERTY, old, this.labelInfo);
      }
docs: {@inheritDoc}