docs: public boolean doCommand(String strCommand, ScreenField sourceSField, int iCommandOptions)
      {
          boolean bFlag = false;
          if (strCommand.equalsIgnoreCase(ThinMenuConstants.UNDO))
          {   // Special - handle undo
              if (m_sfTarget != null)
                  if (m_sfTarget.getScreenFieldView().getControl() != null)
                  if (m_sfTarget.getScreenFieldView().hasFocus())
              {
                  if (m_objUndo == m_sfTarget)
                  {
                      m_sfTarget.fieldToControl();    // Restore original data
                  }
                  else
                  {
                      BaseField field = (BaseField)m_sfTarget.getConverter().getField();
                      if (field != null)
                          field.setData(m_objUndo);
                  }
                  bFlag = true; // Command handled
              }
          }
          //xif (bFlag == false) The AppletScreen doesn't processes any commands (child screens will)
          //x    bFlag = super.doCommand(strCommand, sourceSField, iUseSameWindow);  // This will send the command to my parent
          if (this.getScreenFieldView() != null)
              return this.getScreenFieldView().doCommand(strCommand);    // Instead I do this
          return bFlag;
      }