WPFObject() for ListBox without index not working

I find a good way, I use find.

look

def SelectListBoxItem(ListBox,Contain = ''):
    
        try:
        
                Delay(Time.OptTimes('Nix'))
                
                ListBox.Click()
                
                Item = Aliases.JTL_Wawi.Popup.Root.ListBoxEdit
                
                SubItem = Item.FindChild('WPFControlText',Contain,1)
                
                WaitForAvailablity(Item)
                
                if isinstance(Contain, int):
                        if Contain == 0 :
                                Contain = 1
                                
                        Item.WPFObject("ListBoxEditItem", '', Contain).Click()
                elif Contain == '':
                        Item.WPFObject("ListBoxEditItem", Contain,1).Click()
                else:
                        if SubItem.Exists:
                                SubItem.Click()
                        else:
                                Item.WPFObject("ListBoxEditItem","", 1).Click() 
                
        except Exception as exp:
                Log.Message('ListBoxEditItem - type:' + str(exp))