Bubble Chart assistance

Leom

<p>I would like to build a bubble chart that plots:</p><p> </p><p>Y axis - gross units sold</p><p>X axis - net units sold</p><p>S axis  - return units</p><p> </p><p>I want to color code the bubbles based on the product type, but I cannot find</p><p>where to set this value. All my test charts come out in one color.</p><p> </p><p>Can anyone advise if there is a setting or scripting to control the color of the bubbles?  Thank you.</p>