Why is it that when I create a product using ZClasses that when I call the product from a dtml method like <dtml-var clickable_graph>

that I get :<FONT face=Arial><clickable_graph instance at 0176B930></FONT><FONT face=Arial></FONT> <FONT face=Arial>and not the product? </FONT><FONT face=Arial></FONT> <FONT face=Arial>What am I doing wrong?</FONT><FONT face=Arial></FONT> <FONT face=Arial>Thanks,</FONT><FONT face=Arial></FONT> <FONT face=Arial>KB</FONT>