Scroll method fires too soon in web script

[User (Legacy)]

I have a chart with fairly large number of points which takes a second or

two to load.  I have the following script:

Sub Window_OnLoad

    ' alert "Hello"

    Chrt.Scroll 7, 0  'go to end of chart

End Sub

This works on some other charts but not this one.  If I add in the alert

line I can delay execution and it works fine. The chart is one of four

loaded inside four separate frames.  Is there a chart event which I can use

to be sure this fires after the chart is fully loaded?

Thanks,

   David