Hi all, How could I change grid opacity in vtkChartXY? I tried chart->GetAxis(vtkAxis::BOTTOM)->GetGridPen()->SetOpacity(0.6); But no effect. Thanks Jothy -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20110812/8c762a89/attachment.htm>