using cairngrom , save result into Model locator, then use
that list here...
<mx:ComboBox id="sortCombo1Cb"
styleName="myComboBoxDropDowns" width="82"
change="SortList(event);" selectedIndex="0"
dataProvider="{objModelLocator.ColumnsList}"
labelField="headerText" labelFunction="validateHeaderText"
toolTip="Choose property for Sort"/>