Application Class Quit method

[Jessica]

I am having a problem with the applicationClass Quit
method I use it then set the reference to null I also
found somehting that suggested using the marshall to
remove the obj reference but for some reason the app
object reopens can anyone help below is the snipit from
my code the myAppClass is the Visio ApplicationClass
object

myAppClass.Quit();
myAppClass = null;