How to show the comment on the metric

[#1]

Hi All,

I was wondering how to show the comment on the Metric which is in the Pivot table.

Like:

Date, SalesRevenue

2011-1-1, 200

When the user suspends the mouse on the Metric(SalesRevenue), it should shows the Comment as the popup like "this SalesRevenue is the revenue..."

How to finish it?

Thanks.