Hi Narcís, Thanks for the answer. I really need my own lines, because the users of the program draw some objects (which are a block of lines) in the chart. I have found my mistake. After call CalcPosPoint I have some values, I need do some additions with these values for the new line position. I use...

I'm usind Builder 5 and TeeChart 5.02. In the chart, I draw some custom lines with Canvas->MoveTo and LineTo, I can move the lines in the chart using the MouseMove event and CalcPosPoint to redraw the line on the new position. This works fine. The problem is when I am using the log scale in the Axis...