Positioning Pop-Ups

Question

I seem to only be able to specify the X and Y coordinates for
pop-ups. I need my pop-up to always take up the right 70% of the
application size and 100% of the height. The percentages need to
stay consistent if the user re-sizes the main window. With regular
items, this is quite simple, but I can't figure out how to do this
with a pop-up.

Answer 1

I'm not doing something quite right. My code below:
<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute" creationComplete="initApp();"
resize="resizeApp();">
<mx:Script>
<![CDATA[
import mx.managers.PopUpManager;
import mx.core.IFlexDisplayObject;
import MyLoginForm;
private var helpWindow:IFlexDisplayObject;
private function initApp():void{
maximize();
private function showLogin():void {
helpWindow = PopUpManager.createPopUp(this, MyLoginForm,
false);
private function resizeApp():void{
//This doesn't work
//helpWindow.x = 0;
//helpWindow.y = parent.width * .7
]]>
</mx:Script>
<mx:VBox width="300" height="300">
</mx:VBox>
<mx:Button click="showLogin()" label="Login" x="10"
y="10"/>
</mx:WindowedApplication>
*******MyLoginForm.mxml***************************
<?xml version="1.0"?>
<!-- containers\layouts\myComponents\MyLoginForm.mxml
-->
<mx:TitleWindow xmlns:mx="
http://www.adobe.com/2006/mxml"
creationComplete="initWindow();" showCloseButton="true"
close="PopUpManager.removePopUp(this);">
<mx:Script>
<![CDATA[
import mx.managers.PopUpManager;
private function initWindow():void {
PopUpManager.bringToFront(this);
this.y = 0;
this.x = parent.width * .3;
this.height = parent.height;
this.width = parent.width * .7;
private function processLogin():void {
// Check credentials (not shown) then remove pop up.
PopUpManager.removePopUp(this);
]]>
</mx:Script>
<mx:Form>
<mx:FormItem label="User Name">
<mx:TextInput id="username" width="100%"/>
</mx:FormItem>
<mx:FormItem label="Password">
<mx:TextInput id="password"
displayAsPassword="true"
width="100%"/>
</mx:FormItem>
</mx:Form>
<mx:HBox>
<mx:Button click="processLogin();" label="OK"/>
<mx:Button
label="Cancel"
click="PopUpManager.removePopUp(this);"/>
</mx:HBox>
<mx:Text id="myText" text="{parent.width}"
width="88"/>
</mx:TitleWindow>