code: boolean setGroupCountSize(int count, int size)
      {
          if (count <= 0 || size <= 0) {
              return false;
          }
          m_groupcount_ = count;
          m_groupsize_ = size;
          return true;
      }
docs: Sets the number of group and size of each group in number of char
  @param count number of groups
  @param size size of group in char
  @return true if group size is set correctly