docs: public void updateField(int iSFieldSeq, Object objData)
      {
          try   {
              ScreenField sField = null;
              if (iSFieldSeq != -1)
                  sField = m_gridScreen.getSField(this.getRelativeSField(iSFieldSeq));
              if (sField != null)
              {
                  this.editTargetRecord();
                  sField.getConverter().setData(objData);
                  this.updateTargetRecord();   // Read this record
              }
          } catch (Exception ex)  {
              ex.printStackTrace();
          }
      }