getColumnModel - 2.0? Help...

[Tbaseflug]

I had the below function in 1.x - porting my app over to 2.0 and the getColumnModel is breaking - what can I do to the below to make it work in 2.0? Any help would be greatly apreciated as I am up against a tight deadline...

var GetColumnTotal = function (grid, columnIndex) {
    var total = 0,
        dataIndex = grid.getColumnModel().getDataIndex(columnIndex);
    grid.getStore().each(function (r) {
        total += parseInt(r.get(dataIndex));
    });
    return total;
};

[RCN]

Please try to use GridPanel's columns property.