private variable is is_test of string type, in userobject.
is_test value is 1
create command button in this userobject
create event ue_test in userobject
command button call parent event ue_test

event

  ue_msgbox

controll

   command button cb_1 - title is userobject

       event clicked : parent.Event ue_msgbox()

use this object in window object.
this object same name instance variable is_test in window object.
window instance variable is_test value is 5
create command button in this window
command button call messagebox("", is_test)
this userobject ue_msgbox call messagebox("", is_test)

window object w_privatevariable

instance variables

  string is_test = "5"

controll

   command button cb_1 - title is windows

       event clicked : messagebox("", is_test)

   u_privatevariable uo_1

       event ue_msgbox : messagebox("", is_test)

run PB, window command button click message is 5, userobject command button click message is 5
run appeon, window command button click message is 5, userobject command button click message is 1

this userobject variable is private.