我想以编程方式更改火花组合框中突出显示的项目。当带有所选项目的组合框弹出窗口打开时，它在弹出窗口中显示为突出显示的颜色。现在打开弹出窗口后，我通过设置 selectedIndex 和 selectedItem 属性以编程方式更改了所选项目。文本输入随着给定的所选项目而更改，但突出显示的颜色仍然显示之前的值。如何将该突出显示的项目更改为选定项目。任何人都可以为此提供解决方案。
public class AutoSortComboBox extends ComboBox{
public function AutoSortComboBox ():void {
super();
}
protected function sortDataProvider(descending:Boolean):void{
var arrColl:ArrayCollection = this.dataProvider as ArrayCollection;
var selectedItem:Object = this.selectedItem as Object;
this.selectedIndex = -1;
var dataSortField:SortField = new SortField();
dataSortField.name = "label";
dataSortField.numeric = false;
dataSortField.descending = descending;
/* Create the Sort object and add the SortField object created earlier to the array of fields to sort on. */
var numericDataSort:Sort = new Sort();
numericDataSort.fields = [dataSortField];
arrColl.sort = numericDataSort;
arrColl.refresh();
if(selectedItem != null)
{
for(var i:int=0;i<arrColl.length;i++)
{
if(selectedItem.label == arrColl[i].label)
this.selectedIndex = i;
}
this.selectedItem = selectedItem;
}
}
}