With a few steps you can enable alternate background colors on the grid.
The background color should be generated by the function depending on the row order in the grid.
var alternate = function(){
return this.getRowProperty("order") % 2 ? "#fcfaf6" : "#ffffff";
}
Then you have to create a new row template.
var row = new Active.Templates.Row;
Assign a color function to the background color style.
row.setStyle("background", alternate);
An use this modified row template instead of standard one.
obj.setTemplate("row", row);