itemtemplate selection by type in xaml only

some days ago i found my self in need to change the itemtemplate in a listbox according to their type. and if with less code as possible. i had done this in a treeview but i couldnt find the code again. so i needed to figure it out again and with some help from a collegue we ended with this:

[source language='xml']

[/source]

remark: you arent allowed to give a key to that resources. i suppose the type is kind of key here.