[flexcoders] Why can't I add to viewstack dynamically

[boy_trike]

I have a login popup that runs on creationComplete in my main application.  For 
certain 
people I want to add an optional item to the viewstack.  Below is the code 
snippet:

                                if (model.currentUser.employee == 1) {
                                        var temp: CustSearchForm = new 
CustSearchForm;
                                        
parentApplication.myViewStack.addChild(temp);
                                }                                       


However, while this code executes, the new option is not displayed.  What am I 
doing wrong?

Thanks

Bruce