TabNavigator ALL tabs unselected

Question

I am having a problem with the tab navigator. When I clear it
and repopulated it programmatically, it shows all of the tabs as
unselected even though it is showing the contexts of the 1st tab.
I've mocked up a sample that reproduces the issue (see
below). Open the page and click the Rebuild button. Notice that
both tabs are showing as unselected. Also note that clicking sel1st
which sets the selectedIndex to 0 on the tab navigator has no
effect. It is interesting to note that clicking selLast does work
and once that is done sel1st also works.
The problem appears to be caused by removing all of the
children and the later (after the navigator has redrawn?) adding
tabs.
Has anyone seen this problem? Am I missing something?
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute">
<mx:Script>
<![CDATA[
import mx.containers.Canvas;
private var num:int = 0;
private function rebuildTN():void{
tn.removeAllChildren();
callLater(addChildren);
private function addChildren():void{
var child:Canvas;
for(var i:int = 0; i < 2; i++){
child = new Canvas();
child.label = num.toString();
num++;
tn.addChild(child);
]]>
</mx:Script>
<mx:TabNavigator id="tn" x="88" y="48" width="377"
height="255">
<mx:Canvas label="Tab 1" width="100%" height="100%">
</mx:Canvas>
</mx:TabNavigator>
<mx:Button x="253" y="320" label="Rebuild"
click="rebuildTN();"/>
<mx:Button x="216" y="350" label="sel1st"
click="tn.selectedIndex=0;"/>
<mx:Button x="284" y="350" label="selLast"
click="tn.selectedIndex=tn.numChildren-1"/>
</mx:Application>

Answer 1

How do you close those tabs?
Firefox 4 and later versions save the previous session automatically, so there is no longer need for the dialog asking if you want to save the current session.<br />
Use "File > Exit" or "Firefox > Exit" (Mac: "Firefox > Quit Firefox") if you want to restore multiple windows.<br />
You can use "History > Restore Previous Session" to get the previous session at any time.<br />
You may need to click the orange/gray Firefox button to see History.<br />
There is also a "Restore Previous Session" button on the default <b>about:home</b> Home page.<br />