code: public void setText (int row, int column, Object text, int colSpan, String... styles)
      {
          setText(row, column, String.valueOf(text));
          if (colSpan > 0) {
              getFlexCellFormatter().setColSpan(row, column, colSpan);
          }
          setStyleNames(row, column, styles);
      }
docs: Sets the text in the specified cell, with the specified style and column span.
  
  @param text an object whose string value will be displayed.