(Thank you for the explanation and the example. It worked at sudden for me.)
ROW Back:
I was happy too early.
1)
Unfortunately the hint does always show the same text, no matter, where you click at.
2)
And for this I am too stupid:
AHint := Format('Series "%s": x = %.2f, y = %.2f',....
How to say DateToStr(x-axes-value) ?