JWt

Setting the bar color with the role MarkerBrushColorRole does not always show in the chart.

• @Override
  public Object getData(final WModelIndex index, final int role) {
  final int count = grid[index.getColumn()][index.getRow()];
  switch(role) {
  case ItemDataRole.DisplayRole:
  return count;
  case ItemDataRole.MarkerBrushColorRole:
  return count == 0 ? WColor.white : WColor.blue;
  default:
  return null;
  }
  }*

The code sample above makes sure the same grid/column cell is used for both the data and the color. Zero is white and anything else is blue. Check the screenshot - the "back rows" fall under the rule of zero. While the bars clearly show the data is not zero.