Group aggregates in data source

[Sal]

Hi, how do i get values for the GROUP aggregates to use in my own function.  This works with grid aggregates but I can't access the group aggregates for field "channel".

group: {
     field: "channel", aggregates: [
        { field: "sales_7_days", aggregate: "sum" },
        { field: "current_inventory", aggregate: "sum" }
         ]
},

Then in the field:
groupFooterTemplate: "#=kendo.toString(doMath('weeks_inventory'), 'n1')#"

The function doMath is using ds.aggregates() which works for grid level but not for group level!

Please help!
Thanks!

[Sal]

Any help with this please?  I see no mention of this in docs or other areas.
Thanks!