Graphs in VB6

Hi,

I have created a graph in VB6 using MS Chart Control, but I have one problem!

I can get the 'key' to display what I want it to at design time (using the properties box), but at run time the key always reverts back to C1 and C2.

I am entering data into the graph at run time, but not directly from a database.

Incase I am using the wrong terminology, by key, I mean the colour code indicating what each coloured bar represents

Basically, I need to know how to change the key names at run time??

Sorry if this is an easy one
Any help will be greatly appreciated, Thanks, Matt