toolTipTextRenders of y based on x

[nikampe]

When I use the area chart, how can I make sure that the exact y-value is displayed for the specific x-value) E.g. if I have x(1) = 1 and x(2) = 2 and y(1) = 100 and y(2) = 200, the tooltiptextRenders function shows me all values between 100 and 200 when I move the cursor on the chart, and not just 100 as long as x(1) = 1 and 200 as soon as the cursor changes to x(2).
Thanks in advance guys, great work so far.