@Override
  public void paintCaptionDecoration(final RadContainer container, final boolean isRow, final int index, final Graphics2D g2d,
                                     final Rectangle rc) {
    // don't paint gap rows/columns with red background
    if (isGapCell(container, isRow, index)) {
      g2d.setColor(Color.LIGHT_GRAY);
      g2d.fillRect(rc.x, rc.y, rc.width, rc.height);
    }

    if (canCellGrow(container, isRow, index)) {
      drawGrowMarker(isRow, g2d, rc);
    }

    FormLayout layout = (FormLayout) container.getLayout();
    int[][] groups = isRow ? layout.getRowGroups() : layout.getColumnGroups();
    //noinspection MultipleVariablesInDeclaration
    boolean haveTopLeft = false, haveTopRight = false, haveTopLine = false;
    //noinspection MultipleVariablesInDeclaration
    boolean haveBottomLeft = false, haveBottomRight = false, haveBottomLine = false;
    boolean inGroup = false;
    for(int i=0; i<groups.length; i++) {
      int minMember = Integer.MAX_VALUE;
      int maxMember = -1;
      for(int member: groups [i]) {
        minMember = Math.min(member-1, minMember);
        maxMember = Math.max(member-1, maxMember);
        inGroup = inGroup || (member-1 == index);
      }
      if (minMember <= index && index <= maxMember) {
        if (i % 2 == 0) {
          haveTopLeft = haveTopLeft || index > minMember;
          haveTopRight = haveTopRight || index < maxMember;
          haveTopLine = haveTopLine || inGroup;
        }
        else {
          haveBottomLeft = haveBottomLeft || index > minMember;
          haveBottomRight = haveBottomRight || index < maxMember;
          haveBottomLine = haveBottomLine || inGroup;
        }
      }
    }

    g2d.setColor(PlatformColors.BLUE);
    drawGroupLine(rc, isRow, g2d, true, haveTopLeft, haveTopRight, haveTopLine);
    drawGroupLine(rc, isRow, g2d, false, haveBottomLeft, haveBottomRight, haveBottomLine);
  }
@Override
  public void paintCaptionDecoration(final RadContainer container, final boolean isRow, final int index, final Graphics2D g2d,
                                     final Rectangle rc)