Thanks again for a quick reply..

I already did and as far as I can tell, whenever I do something with the dataset, it fails.

But this is a huge application, I also have a grid with the data, and as it moves to sync with selected dots, I think we will settle for that.

Thanks, (sorry for a late reply, but I had to take a break from this project)

But that is what I am doing, at least as far as I can see - my problem is that it does not return anything.

I am having strange problems with "ChartTool1GetText", I need to display a different field value from the selected record, but it does not show. This works: procedure TFForm.ChartTool1GetText(Sender: TMarksTipTool; var Text: string); begin Text := 'Something'; end; The text "Something" always shows....