建议你根据spark.skins.spark.TitleWindowSkin创建自己的皮肤，将Label对应的属性改成idtitleDisplay。
你可以阅读更多关于皮肤的细节in official documentation。
您的窗口的示例皮肤如下（仅添加了一个属性）：
<?xml version="1.0" encoding="utf-8"?>
<s:SparkSkin xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:fb="http://ns.adobe.com/flashbuilder/2009" blendMode="normal" mouseEnabled="false"
minWidth="76" minHeight="76" alpha.disabled="0.5" alpha.disabledWithControlBar="0.5">
<fx:Metadata>
<![CDATA[
/**
* @copy spark.skins.spark.ApplicationSkin#hostComponent
*/
[HostComponent("spark.components.TitleWindow")]
]]>
</fx:Metadata>
<fx:Script fb:purpose="styling">
<![CDATA[
import mx.core.FlexVersion;
/* Define the skin elements that should not be colorized.
For panel, border and title background are skinned, but the content area, background, border, and title text are not. */
static private const exclusions:Array = ["background", "titleDisplay", "contentGroup", "border"];
/* exclusions before Flex 4.5 for backwards-compatibility purposes */
static private const exclusions_4_0:Array = ["background", "titleDisplay", "contentGroup"];
/**
* @private
*/
override public function get colorizeExclusions():Array
{
// Since border is styleable via borderColor, no need to allow chromeColor to affect
// the border. This is wrapped in a compatibility flag since this change was added
// in Flex 4.5
if (FlexVersion.compatibilityVersion < FlexVersion.VERSION_4_5)
{
return exclusions_4_0;
}
return exclusions;
}
/**
* @private
*/
override protected function initializationComplete():void
{
useChromeColor = true;
super.initializationComplete();
}
/**
* @private
*/
override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
{
if (getStyle("borderVisible") == true)
{
border.visible = true;
background.left = background.top = background.right = background.bottom = 1;
contents.left = contents.top = contents.right = contents.bottom = 1;
}
else
{
border.visible = false;
background.left = background.top = background.right = background.bottom = 0;
contents.left = contents.top = contents.right = contents.bottom = 0;
}
dropShadow.visible = getStyle("dropShadowVisible");
var cr:Number = getStyle("cornerRadius");
var withControls:Boolean =
(currentState == "disabledWithControlBar" ||
currentState == "normalWithControlBar" ||
currentState == "inactiveWithControlBar");
if (cornerRadius != cr)
{
cornerRadius = cr;
dropShadow.tlRadius = cornerRadius;
dropShadow.trRadius = cornerRadius;
dropShadow.blRadius = withControls ? cornerRadius : 0;
dropShadow.brRadius = withControls ? cornerRadius : 0;
setPartCornerRadii(topMaskRect, withControls);
setPartCornerRadii(border, withControls);
setPartCornerRadii(background, withControls);
}
if (bottomMaskRect) setPartCornerRadii(bottomMaskRect, withControls);
borderStroke.color = getStyle("borderColor");
borderStroke.alpha = getStyle("borderAlpha");
backgroundFill.color = getStyle("backgroundColor");
backgroundFill.alpha = getStyle("backgroundAlpha");
super.updateDisplayList(unscaledWidth, unscaledHeight);
}
/**
* @private
*/
private function setPartCornerRadii(target:Rect, includeBottom:Boolean):void
{
target.topLeftRadiusX = cornerRadius;
target.topRightRadiusX = cornerRadius;
target.bottomLeftRadiusX = includeBottom ? cornerRadius : 0;
target.bottomRightRadiusX = includeBottom ? cornerRadius : 0;
}
private var cornerRadius:Number;
]]>
</fx:Script>
<s:states>
<s:State name="normal" />
<s:State name="inactive" stateGroups="inactiveGroup" />
<s:State name="disabled" />
<s:State name="normalWithControlBar" stateGroups="withControls" />
<s:State name="inactiveWithControlBar" stateGroups="withControls, inactiveGroup" />
<s:State name="disabledWithControlBar" stateGroups="withControls" />
</s:states>
<!--- drop shadow can't be hittable so it stays sibling of other graphics @private-->
<s:RectangularDropShadow id="dropShadow" blurX="20" blurY="20" alpha="0.32"
alpha.inactiveGroup="0.22" distance="11" distance.inactiveGroup="7"
angle="90" color="0x000000" left="0" top="0" right="0" bottom="0"/>
<!--- drop shadow can't be hittable so all other graphics go in this group -->
<s:Group left="0" right="0" top="0" bottom="0">
<!--- top group mask @private-->
<s:Group left="1" top="1" right="1" bottom="1" id="topGroupMask">
<!--- @private-->
<s:Rect id="topMaskRect" left="0" top="0" right="0" bottom="0">
<s:fill>
<s:SolidColor alpha="0"/>
</s:fill>
</s:Rect>
</s:Group>
<!--- bottom group mask @private-->
<s:Group left="1" top="1" right="1" bottom="1" id="bottomGroupMask"
includeIn="withControls">
<!--- @private-->
<s:Rect id="bottomMaskRect" left="0" top="0" right="0" bottom="0">
<s:fill>
<s:SolidColor alpha="0"/>
</s:fill>
</s:Rect>
</s:Group>
<!--- layer 1: border @private -->
<s:Rect id="border" left="0" right="0" top="0" bottom="0" >
<s:stroke>
<!--- Defines the TitleWindowSkin class's border stroke. The default value is 1. -->
<s:SolidColorStroke id="borderStroke" weight="1" />
</s:stroke>
</s:Rect>
<!-- layer 2: background fill -->
<!--- Defines the appearance of the TitleWindowSkin class's background. -->
<s:Rect id="background" left="1" top="1" right="1" bottom="1">
<s:fill>
<!--- Defines the TitleWindowSkin class's background fill. The default color is 0xFFFFFF. -->
<s:SolidColor id="backgroundFill" color="#FFFFFF"/>
</s:fill>
</s:Rect>
<!-- layer 3: contents -->
<!--- Contains the vertical stack of title bar content and control bar. -->
<s:Group left="1" right="1" top="1" bottom="1" id="contents">
<s:layout>
<s:VerticalLayout gap="0" horizontalAlign="justify" />
</s:layout>
<!--- @private -->
<s:Group id="topGroup" mask="{topGroupMask}">
<!--- layer 0: title bar fill @private -->
<s:Rect id="tbFill" left="0" right="0" top="0" bottom="1">
<s:fill>
<s:LinearGradient rotation="90">
<s:GradientEntry color="0xD2D2D2"
color.inactiveGroup="0xEAEAEA"/>
<s:GradientEntry color="0x9A9A9A"
color.inactiveGroup="0xCECECE"/>
</s:LinearGradient>
</s:fill>
</s:Rect>
<!--- layer 1: title bar highlight @private -->
<s:Rect id="tbHilite" left="0" right="0" top="0" bottom="0">
<s:stroke>
<s:LinearGradientStroke rotation="90" weight="1">
<s:GradientEntry color="0xE6E6E6" />
<s:GradientEntry color="0xFFFFFF" alpha="0.22"/>
</s:LinearGradientStroke>
</s:stroke>
<s:fill>
<s:LinearGradient rotation="90">
<s:GradientEntry color="0xFFFFFF" alpha="0.15" />
<s:GradientEntry color="0xFFFFFF" alpha="0.15" ratio="0.44"/>
<s:GradientEntry color="0xFFFFFF" alpha="0" ratio="0.4401"/>
</s:LinearGradient>
</s:fill>
</s:Rect>
<!--- layer 2: title bar divider @private -->
<s:Rect id="tbDiv" left="0" right="0" height="1" bottom="0">
<s:fill>
<s:SolidColor color="0x000000" alpha="0.75" />
</s:fill>
</s:Rect>
<!-- layer 3: text -->
<!--- @copy spark.components.Panel#titleDisplay -->
<s:Label id="titleDisplay" maxDisplayedLines="1"
left="9" right="36" top="1" bottom="0" minHeight="30"
verticalAlign="middle" fontWeight="bold" fontSize="20" />
<!-- layer 4: moveArea -->
<!--- @copy spark.components.TitleWindow#moveArea -->
<s:Group id="moveArea" left="0" right="0" top="0" bottom="0" />
<!--- @copy spark.components.TitleWindow#closeButton -->
<s:Button id="closeButton" skinClass="spark.skins.spark.TitleWindowCloseButtonSkin"
width="15" height="15" right="7" top="7" />
</s:Group>
<!--
Note: setting the minimum size to 0 here so that changes to the host component's
size will not be thwarted by this skin part's minimum size. This is a compromise,
more about it here: http://bugs.adobe.com/jira/browse/SDK-21143
-->
<!--- @copy spark.components.SkinnableContainer#contentGroup -->
<s:Group id="contentGroup" width="100%" height="100%" minWidth="0" minHeight="0">
</s:Group>
<!--- @private -->
<s:Group id="bottomGroup" minWidth="0" minHeight="0"
includeIn="withControls">
<s:Group left="0" right="0" top="0" bottom="0" mask="{bottomGroupMask}">
<!-- layer 0: control bar divider line -->
<s:Rect left="0" right="0" top="0" height="1" alpha="0.22">
<s:fill>
<s:SolidColor color="0x000000" />
</s:fill>
</s:Rect>
<!-- layer 1: control bar highlight -->
<s:Rect left="0" right="0" top="1" bottom="0">
<s:stroke>
<s:LinearGradientStroke rotation="90" weight="1">
<s:GradientEntry color="0xFFFFFF" />
<s:GradientEntry color="0xD8D8D8" />
</s:LinearGradientStroke>
</s:stroke>
</s:Rect>
<!-- layer 2: control bar fill -->
<s:Rect left="1" right="1" top="2" bottom="1">
<s:fill>
<s:LinearGradient rotation="90">
<s:GradientEntry color="0xEDEDED"/>
<s:GradientEntry color="0xCDCDCD"/>
</s:LinearGradient>
</s:fill>
</s:Rect>
</s:Group>
<!--- @copy spark.components.Panel#controlBarGroup -->
<s:Group id="controlBarGroup" left="0" right="0" top="1" bottom="1" minWidth="0" minHeight="0">
<s:layout>
<s:HorizontalLayout paddingLeft="10" paddingRight="10" paddingTop="7" paddingBottom="7" gap="10" />
</s:layout>
</s:Group>
</s:Group>
</s:Group>
</s:Group>
</s:SparkSkin>
您可以使用外部 CSS 文件或直接在 MXML 中应用它：
<s:TitleWindow skinClass="MyTitleWindowSkin" />
或者在 ActionScript 中：
myWindow.setStyle("skinClass", MyTitleWindowSkin);