In Excel 2003 VBA, I am using the Chart_MouseDown Event and the
GetChartElement Method to make a scatter chart interactive. It
works perfectly most of the time.

But, occassionally, the user clicks on a point in a data series
and Excel activates the worksheet containing the data for the
series then launches GoalSeek. The Goal Seek dialog is
pre-populated with reference to the cell containing the x-value
of the point that the user clicked on.

Any ideas why this is happening and how to prevent it?

Thanks!