如何在列表框中使用双向绑定?

I have a ListBox including an ItemTemplate with a StackPanel.I assign a generic List to my Listbox itemsource.I want to change that stackpanel's visibility. (Change it's visibility to collapsed when i click mouseleftbutton "closeAll" and close all stackPanel items in Listbox).I want to do that with stackpanel visibility={Binding Acikmi}. I have PastAndOr Class and its property "Acikmi" and its first value is "visible". How Can I Change "Acikmi" value from "visible" to "collapsed" with using binding two way mode?I have a ListBox including an ItemTemplate with