RemovePopUp command from parent application (not the popup).

I am trying to remove a popup from the main application
instead of the popup window. This way the window will close when
they change tabs within the app or reclick the button. I can get it
to close from within the popup with this statement just fine:
PopUpManager.removePopUp(this).
But shouldn't I be able to just use the same command with the
object name to close it from the app itself, like this?
PopUpManager.removePopUp(helpinfopop).
I've searched this forum and Google and can't come up with
anyone doing this. Everyone closes the popup from within the popup
itself.
private function showHelp():void {
if(shHelp=="false"){
shHelp="true";
var helpinfopop:helpinfo =
helpinfo(PopUpManager.createPopUp(this, helpinfo, false));
helpinfopop.title="Help";
helpinfopop.showCloseButton=true;
helpinfopop.hscreen=allinfo.selectedChild.name;
PopUpManager.centerPopUp(helpinfopop);
else {
shHelp="false";
PopUpManager.removePopUp(helpinfopop);
Thanks in advance.
Chris

Dmitri - Thanks for the help, but I'm still having some
problems. I've tried the following two ways:
private function showHelp():void {
var helpinfopop:helpinfo; <------ MOVED IT UP
if(shHelp=="false"){
shHelp="true";
helpinfo(PopUpManager.createPopUp(this, helpinfo, false));
helpinfopop.title="Help";
helpinfopop.showCloseButton=true;
helpinfopop.hscreen=allinfo.selectedChild.name;
PopUpManager.centerPopUp(helpinfopop);
else {
shHelp="false";
PopUpManager.removePopUp(helpinfopop);
public var helpinfopop:helpinfo; <----- MOVED IT UP AND
OUT
private function showHelp():void {
if(shHelp=="false"){
shHelp="true";
helpinfo(PopUpManager.createPopUp(this, helpinfo, false));
helpinfopop.title="Help";
helpinfopop.showCloseButton=true;
helpinfopop.hscreen=allinfo.selectedChild.name;
PopUpManager.centerPopUp(helpinfopop);
else {
shHelp="false";
PopUpManager.removePopUp(helpinfopop);
In both scenarios, I get a new error stating that it "Cannot
access a property or method of a null object reference." In both
cases it is referencing the line: helpinfopop.title="Help".
I'm assuming I'm doing something else wrong. I was really
starting to get the hang of Flex. I've been using it for about 5
months now. But apparently I'm missing something.....
Thanks for the help so far. I look forward to your response.
Chris

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