Flex 利用PopUpButton创建TitleWindow

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<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/04/13/creating-a-pop-up-titlewindow-using-the-popupbutton-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">
    <mx:Style>
        TitleWindow {
            roundedBottomCorners: false;
            borderColor: haloSilver;
            backgroundColor: haloSilver;
            borderAlpha: 0.8;
            backgroundAlpha: 0.8;
            dropShadowEnabled: false;
        }
    </mx:Style>
    <mx:Script>
        <!--[CDATA[
            import mx.controls.CheckBox;
            import mx.controls.dataGridClasses.DataGridColumn;
            private function checkBox_change(evt:Event):void {
                var ch:CheckBox = evt.currentTarget as CheckBox;
                var idx:int = int(ch.data);
                var obj:Object = arrColl.getItemAt(idx);
                obj.sel = ch.selected;
                arrColl.disableAutoUpdate();
                arrColl.setItemAt(obj,idx);
            }
            private function selectAll(evt:Event):void {
                var idx:int;
                var item:Object;
                for (idx=0; idx<arrColl.length; idx++) {
                    item = arrColl.getItemAt(idx);
                    item.sel = CheckBox(evt.currentTarget).selected;
                }
                arrColl.refresh();
            }
            private function sel_labelFunc(item:Object,col:DataGridColumn):String {
                var bool:Boolean = item.hasOwnProperty("sel") &&
                            (item.sel == "true" || item.sel == true);
                return bool.toString();
            }
        ]]-->
    </mx:Script>
    <mx:ArrayCollection id="arrColl">
        <mx:source>
            <mx:Array id="arr">
                <mx:Object label="Button" />
                <mx:Object label="ButtonBar" />
                <mx:Object label="CheckBox" />
                <mx:Object label="ColorPicker" sel="true" />
                <mx:Object label="ComboBox" sel="true" />
                <mx:Object label="DataGrid" sel="true" />
                <mx:Object label="DateChooser" />
                <mx:Object label="DateField" sel="true" />
                <mx:Object label="HorizontalList" />
                <mx:Object label="HRule" />
                <mx:Object label="HSlider" />
                <mx:Object label="Image" />
                <mx:Object label="Label" />
                <mx:Object label="LinkBar" />
                <mx:Object label="LinkButton" />
                <mx:Object label="List" sel="true" />
                <mx:Object label="Menu" />
                <mx:Object label="MenuBar" />
                <mx:Object label="NumericStepper" sel="true" />
                <mx:Object label="ProgressBar" />
                <mx:Object label="RadioButton" />
                <mx:Object label="RadioButtonGroup" />
                <mx:Object label="RichTextEditor" sel="true" />
                <mx:Object label="Spacer" />
                <mx:Object label="SWFLoader" />
                <mx:Object label="TabBar" />
                <mx:Object label="Text" />
                <mx:Object label="TextArea" />
                <mx:Object label="TextInput" />
                <mx:Object label="TileList" />
                <mx:Object label="Tree" sel="true" />
                <mx:Object label="VideoDisplay" />
                <mx:Object label="VRule" />
                <mx:Object label="VScrollBar" />
                <mx:Object label="VSlider" />
            </mx:Array>
        </mx:source>
    </mx:ArrayCollection>
    <mx:ApplicationControlBar dock="true">
        <mx:PopUpButton id="popUpButton"
                label="Please select some components"
                openAlways="true"
                close="arrColl.refresh();">
            <mx:popUp>
                <mx:TitleWindow id="titleWin"
                        height="200"
                        showCloseButton="true"
                        verticalScrollPolicy="on"
                        horizontalScrollPolicy="off"
                        close="popUpButton.close();">
                    <mx:ToolBar width="320">
                        <mx:Repeater id="myRep"
                                dataProvider="{arrColl}">
                            <mx:CheckBox data="{myRep.currentIndex}"
                                    label="{myRep.currentItem.label}"
                                    selected="{myRep.currentItem.sel}"
                                    change="checkBox_change(event);"
                                    width="100" />
                        </mx:Repeater>
                    </mx:ToolBar>
                    <mx:ControlBar>
                        <mx:CheckBox label="Select All"
                                labelPlacement="left"
                                change="selectAll(event);" />
                    </mx:ControlBar>
                </mx:TitleWindow>
            </mx:popUp>
        </mx:PopUpButton>
    </mx:ApplicationControlBar>
    <mx:DataGrid dataProvider="{arrColl}">
        <mx:columns>
            <mx:DataGridColumn dataField="label" />
            <mx:DataGridColumn dataField="sel"
                    labelFunction="sel_labelFunc" />
        </mx:columns>
    </mx:DataGrid>
</mx:Application>