as3 check to see if SharedObject exists

I been desperatly trying to set up a if statement that will change a dynamic textbox via the existence of a sharedobject, but no matter how I set it up I just can't get it to work and I don't understand it, help me please I tried to wrap my head around it

var ujName:SharedObject = SharedObject.getLocal("UncleJeffName")
ujName.data.fullName 
ujName.flush();


if(ujName.hasOwnProperty("UncleJeffName"))
   {

       trace("YES")
   }
   else
   {

       trace("NO")
   }

This isn't the original code of it but in more basic form without the textbox , and it still traces no