code: public boolean doCommand(String strCommand, ScreenField sourceSField, int iCommandOptions)
      {
          if (strCommand.equalsIgnoreCase(ThinMenuConstants.CLOSE))
          {
              this.free();
              return true;
          }
          return super.doCommand(strCommand, sourceSField, iCommandOptions);
      }
docs: Process the command.
  Step 1 - Process the command if possible and return true if processed.
  Step 2 - If I can't process, pass to all children (with me as the source).
  Step 3 - If children didn't process, pass to parent (with me as the source).
  Note: Never pass to a parent or child the matches the source (to avoid an endless loop).
  @param strCommand The command to process.
  @param sourceSField The source screen field (to avoid echos).
  @param iCommandOptions If this command creates a new screen, create in a new window?
  @param true if success.