Change ListViewItems style when SelectionMode is set to Multiple

I have a ListView with
SelectionMode = None
. When I change it to "Multiple" I want the items in the list to change their style and add a border around each of them so the user knows he can select them (see images). I'm using MVVMLight so please help me in a VM way if you can. Anyway, any
solution will be appreciatted.
Thanks in advance.

That's a good answer except for the part "let say you can iterate through each item in list" becasuse I can not access the control through the VM... Any idea how can I achieve that?
I meant, you might be binding listbox with some ObservableCollection(or else) from view model, so access the same collection from your view & iterate through each of its item to change the specific property.
See for e..g this, how the collection is accessed through VM : https://msdn.microsoft.com/en-us/library/windows/apps/gg521153(v=vs.105).aspx
http://developer.nokia.com/community/wiki/Using_Crypto%2B%2B_library_with_Windows_Phone_8

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