Hi!
I have spent some hours in investigation on the LinePen.Width .
Before I start creating an example may be I can get som advices;
Have checked in linepen_width.lpr:
I don't have: tachartlazaruspkg, ( seems no difference );
Dropped on myForm: TChart, TChartToolset, TChartStyles
Defined in the Form: LSeries: TLineSeries;
But I have to create: LSeries := TLineSeries.Create(MyChart);
and doing like this: MyChart.AddSeries(LSeries);
Any ideas?