Sort a Flex ArrayCollection. Note, to programmatically sort values in a Spark DataGrid, one way is to sort the dataProvider - which is usually an ArrayCollection. (Another way is to use the sortbyColumns() method on some event.)

SortArrayCollection.as

var dataSortField:SortField = new SortField();
dataSortField.name = "activity";
dataSortField.numeric = false;
var sort:Sort = new Sort();
sort.fields = [dataSortField];
this.taskAc.sort;
this.taskAc.refresh();