I am uploading a notebook (generated in Mathematica 7) that does what I think you wish to see. My apologies for not reusing your notebook, because it exhibits instability (mostly hangs, or errors due to the Row["\ntime...] I think) on my laptop.

The overall idea is the same (as I understood it). Given a dataset, I plot the dataset and overlay a moving average of n-elements chosen from a subset of dataset ranging from a to b. In the sample, I enable tooltip for both the raw dataset and the moving average. I hope this is helpful. Thank you.

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Hi Isaac, Sorry for my late reply. Many thanks for your help and information. Jos

Sorry, I forgot to attach the file. Thanks. Jos

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Where do you want a Tooltip? There isn't an example in the code of where you've tried this. If you are wanting it to be in the PlotLabel where you indicate then replace the PlotLabel expression by

PlotLabel -> 
 Tooltip[Style["Test with Tooltip", "Title", 12], "This is a tooltip"]

Also there's a bug in the notebook you posted. Replace

"\ntime span:"

with

Row[{"\ntime span:"}]

Otherwise the bottom two sliders do not work.

Let me know if these are the things you are asking. If not, let me know as well ;-)