Dynamic Viewstack member problem

Question

OK, based on information from an earlier helpful post, I am
trying to remove itsems from a viewstack and add new ones based on
a user response.
/* set the viewstack members */
private function setStack(_which:int) : void {
mainViewStack.removeChild(s0);
mainViewStack.removeChild(s1);
if (_which == 1){
var _step2:Step2 = new Step2();
mainViewStack.addChild(_step2);
This is working, in as far as the old 2 items are deleted and
the new item appears on the stage. However, I have a couple of
questions:
-- this only works in my Step2.mxml is in the same folder as
the main app. Originally, it was in "/components", so how would I
specify to look in the subdirectory like that?
-- the contents on my component appear, but the linkbar bound
to the viewstack does not pick up on the new member. How do I make
that happen?

Answer 1

Ok, I solved the first issue. In the original VS I had the
component as
<comp:Step2 id="s2"/>, with
xmlns:comp="myComponents.*", but I realized that only worked for
the mxml, and for AS I had to do "import myComponents.*"
I'd still like to know, however, how to refresh/update the
linkBar to pick up the added member. Currently, it's bound to the
viewStach, as in:
<mx:LinkBar id="mainMenu" dataProvider="{mainViewStack}"
width="100%" toolTipField="toolTip" />