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Binding to child column data

I thought I saw an article somewhere about binding a top-level column value to a child row value in a way that would allow for something analogous to:

{ headerText: "Inv Avail. Dt.", key: childRow => Max("AvailDate"), width: "140px", dataType: "date", format: "MM/dd/yyy" }

{ headerText: "Board Feet", key: childRow => Sum("BoardFeet"), width: 85px, dataType: "number", format: "###,###,###" }

Is something like this possible?