MyWindow.as

<?xml version="1.0"?>
<!--
Created with IntelliJ IDEA.
User: kelegorm
Date: 25.03.13
Time: 11:17
-->
<s:TitleWindow xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"
        close="closeHandler(event)"
        skinClass="skins.MyWindowSkin"
        keyDown="keyDown2Handler(event)"
        mouseDownOutside="mouseDownOutsideHandler(event)"
        >
    <s:layout>
        <s:VerticalLayout paddingTop="10" paddingLeft="10" paddingRight="10" paddingBottom="10" gap="10" />
    </s:layout>
    <fx:Metadata>
        [Event(name='buttonClick', type="view.windows.MyWindowEvent")]
        [Event(name='cancelClick', type="view.windows.MyWindowEvent")]
    </fx:Metadata>
    <fx:Script><![CDATA[
        import mx.events.CloseEvent;
        import mx.events.FlexMouseEvent;
        import mx.managers.PopUpManager;

        import view.components.MyButton;

        [Bindable]
        public var buttonLabel:String = "";

        [Bindable]
        public var buttonHelp:String = "";

        [SkinPart(required=true)]
        public var okButton:MyButton;

        [SkinPart(required=true)]
        public var cancelButton:MyButton;

        public var hideByOutsideClick:Boolean = false;

        [Bindable]
        public var showButtons:Boolean = true;

        public function close():void {
            dispatchEvent(new CloseEvent(CloseEvent.CLOSE));
        }

        protected function keyDown2Handler(event:KeyboardEvent):void {
            if (event.keyCode == 27) {
                dispatchEvent(new CloseEvent(CloseEvent.CLOSE));
            }
        }

        override protected function partAdded(partName:String, instance:Object):void {
            super.partAdded(partName, instance);

            switch (instance) {
                case okButton:
                    okButton.addEventListener(MouseEvent.CLICK, button_clickHandler);
                    break;
                case cancelButton:
                    cancelButton.addEventListener(MouseEvent.CLICK, cancelButton_clickHandler);
                    break;
            }
        }

        private function button_clickHandler(event:MouseEvent):void {
            dispatchEvent(new MyWindowEvent(MyWindowEvent.BUTTON_CLICK));
        }

        private function cancelButton_clickHandler(event:MouseEvent):void {
            dispatchEvent(new MyWindowEvent(MyWindowEvent.CANCEL_CLICK));
            dispatchEvent(new CloseEvent(CloseEvent.CLOSE));
        }

        protected function closeHandler(event:CloseEvent):void {
            PopUpManager.removePopUp(this);
            focusManager.deactivate();
        }

        private function mouseDownOutsideHandler(event:FlexMouseEvent):void {
            if (hideByOutsideClick) {
                dispatchEvent(new CloseEvent(CloseEvent.CLOSE));
            }
        }
        ]]>
    </fx:Script>
</s:TitleWindow>

MyWindowEvent.as

/**
 * Created with IntelliJ IDEA.
 * User: kelegorm
 * Date: 30.04.13
 * Time: 23:34
 */
package view.windows {
import flash.events.Event;

public class MyWindowEvent extends Event {
    public static const BUTTON_CLICK:String = 'buttonClick';
    public static const CANCEL_CLICK:String = 'cancelClick';
    public function MyWindowEvent(type:String, bubbles:Boolean = false, cancelable:Boolean = false) {
        super(type, bubbles, cancelable);
    }
}
}

Usage

//button click handler
var window:MyFineWindow = new MyFineWindow();
PopUpManager.addPopUp(window, FlexGlobals.topLevelApplication as DisplayObject, true);
PopUpManager.centerPopUp(window);

<?xml version="1.0"?>
<!-- MyFineWindow.mxml -->
<windows:MyWindow xmlns:fx="http://ns.adobe.com/mxml/2009"
                  xmlns:windows="view.windows.*" xmlns:components="view.components.*" xmlns:layouts="spark.layouts.*"
                  showButtons="false"
                  hideByOutsideClick="true"
                  minHeight="150"
                  minWidth="230"
        >

    <windows:layout>
        <layouts:BasicLayout />
    </windows:layout>
    
    <s:Label test="MyFineWindow!"/>
    
</windows:MyWindow>