code: public void setHTML (int row, int column, String text, int colSpan, String... styles)
      {
          setHTML(row, column, text);
          if (colSpan > 0) {
              getFlexCellFormatter().setColSpan(row, column, colSpan);
          }
          setStyleNames(row, column, styles);
      }
docs: Sets the HTML in the specified cell, with the specified style and column span.