Column chart in SQL BI

Hi,

I have this table:

Product (char)

AtStation1 (datetime)

AtStation2 (datetime)

AtStation3 (datetime)

I created column charts for each station showing how many total (count) products at AtStation1 , 2 and 3 ant any given time.  One axis is the count of products and the other is time.  I though since the axis are the same I should be able to show (superimpose) all these 3 column charts in to one.

How do I achive this.

Thanks.

AE