Click an item by its name in a treeview

Hi, I want to click an item by its name in a treeview. For example, I want to click A_Mixed_US_2012 in the attachment of Capture 1. The only feasible approach I have tried is  :

PROJECT_TREEVIEW.ClickItem("|[2]")



PROJECT_TREEVIEW is the alias of the mapped name of the treeview.



The Capture 2 in the attachment is the Object Browser for the treeview



I tried the following approaches. Neither of them is feasible.

1. 
   PROJECT_TREEVIEW.ClickItem("|A_Mixed_US_2012 ")


2. 
   PROJECT_TREEVIEW.ClickItem("||A_Mixed_US_2012 ")


3. 
   PROJECT_TREEVIEW.ClickItem("|[2]|A_Mixed_US_2012 ")

Any suggestion is appreciated. Thanks in advance.