Actionscript 3 AS3设置组合框背景色？

我有下面的代码来设置组合框下拉列表的样式，但我似乎无法使用背景色。我使用//注释来显示它不喜欢的行：

var myTextFormat:TextFormat = new TextFormat();
myTextFormat.font = "Arial";
myTextFormat.color = 0xFFFFFF;
myTextFormat.size = 10;
myTextFormat.background = true; // Doesn't like this line
myTextFormat.backgroundColor = 0xFFFFFF; // Doesn't like this line

var m = 0;
function comboBoxChange(e:Event):void {
var scriptVars:URLVariables = new URLVariables();
    trace("YOU CHANGED ME!!!"); 
    //scriptVars["InstructorName" + [m]] = myXML.Instructors.InstructorName[m];
    trace(e.target.selectedItem.label);


    //Change the comboBox color if Instructor selected
    // Go back to plain if no Instructor
    if (e.target.selectedIndex == 0){
        trace("EMPTY");
        e.target.transform.colorTransform = new ColorTransform;
    }
    else
    {
        // Shade of black indicates slot allocated to Instructor
        my_color.color = 0x002222;
        //e.target.transform.colorTransform = my_color;
        e.target.parent.alpha = 1;
        e.target.textField.setStyle ("textFormat",myTextFormat);
    }

}

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也许你要找的是

contentBackgroundColor

风格的

ComboBox

s|ComboBox {
   contentBackgroundColor: red;
}

或

这似乎奏效了：

---

e、 target.textField.textField.background=true；e、 target.textField.textField.backgroundColor=0x000000

这似乎对我不起作用。但它不会产生任何错误。我使用了：e.target.setStyle（'contentBackgroundColor'，0x000000）；这似乎有效：e.target.textField.textField.background=true；e.target.textField.textField.backgroundColor=0x000000；

combo.setStyle('contentBackgroundColor', 'red');