docs: public boolean handleCommand(String strCommand, ScreenField sourceSField, int iUseSameWindow)
      {
          boolean bHandled = false;
          if (!(this instanceof BasePanel))   // BasePanel already called doCommand.
              bHandled = this.doCommand(strCommand, sourceSField, iUseSameWindow);   // Do I handle it?
  
          if (bHandled == false)
              if (this.getParentScreen() != null)
                  if (this.getParentScreen() != sourceSField)
                      return this.getParentScreen().handleCommand(strCommand, this, iUseSameWindow);  // Send it up to see if the parent wants to handle it
          return bHandled;
      }