<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/08/16/creating-an-undraggable-titlewindow-container-in-flex/ -->
<mx:TitleWindow xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="absolute"
        showCloseButton="true"
        title="TitleWindow"
        width="300"
        height="200"
        close="titleWin_close(event);">

    <mx:Script>
        <![CDATA[
            import mx.core.IFlexDisplayObject;
            import mx.events.CloseEvent;
            import mx.managers.PopUpManager;

            private function titleWin_close(evt:CloseEvent):void {
                PopUpManager.removePopUp(evt.target as IFlexDisplayObject);
            }

            private function checkBox_change(evt:Event):void {
                this.isPopUp = checkBox.selected;
            }
        ]]>
    </mx:Script>

    <mx:Label text="Drag this window"
            horizontalCenter="0"
            verticalCenter="0" />

    <mx:ControlBar>
        <mx:CheckBox id="checkBox"
                label="isPopUp:"
                labelPlacement="left"
                selected="true"
                change="checkBox_change(event);" />            
    </mx:ControlBar>

</mx:TitleWindow>