Hello Claudio,

Thank you for contacting Infragistics. I took a look at your sample and determined the issue is caused from incrementing the count variable when adding fragments. I was able to resolve this by either decrementing the count when setting the ValueMemberPath or only incrementing the count when the number of series is equal to the number of fragments. In cases where you have a different number of fragments per series I would recommend the first solution. I've updated and reattached your solution to demonstrate the first approach. Let me know if this is a viable.

eg.

for (int i = 0; i < numberSeries; i++) {
                var fragment = new Infragistics.Controls.Charts.StackedFragmentSeries();
                fragment.ValueMemberPath = String.Format("TonnageCollection[{0}].Tonnage", count--);
                scChart.Series.Add(fragment);
                count++;
            }

Let me know if you also have any additional questions.

Update:

Sorry, but it didn't work, it went over our heads that there was a problem with it, the charts will only draw only same length columns (because you're always getting the first data).

We've tried a lot of other methods with no solution

I'm attaching two images as an example.

thank you.