on_selection_change binding

gistfile1.txt

here is the button that does the job i want on_selection_change to do:
 
in kv
 
 Button:
                        id: mybutton_id
                        detailBox: detailBox
                        size_hint: (None, .1)
                        text: 'press'
                        on_release: detailBox.adapter= ListAdapter(data=StudentDetail(lastname(mylist.adapter.selection[0].text), firstname(mylist.adapter.selection[0].text)),  cls=ListItemLabel)
                        on_release: photo.source= photoName(StudentDetail(lastname(mylist.adapter.selection[0].text), firstname(mylist.adapter.selection[0].text))[6])
 
 
this is my app:
 
class StudentlistApp(App):
 
    def __init__(self, **kwargs):
        super(StudentlistApp, self).__init__(**kwargs)
 
        self.list_item_args_converter = \
        lambda row_index, rec: {'text': rec,
        'size_hint_y': None, 'deselected_color': [.1,0,.3,1],
        'height': 25}
 
        self.studentAdapter= ListAdapter(data=StudentList(),
        allow_empty_selection= False, cls= ListItemButton)
        self.detailboxAdapter= ListAdapter(data=StudentDetail('0', '0'),  cls=ListItemLabel)
        self.detailboxAdapter.on_selection_change= ListAdapter(data=StudentDetail('Barcelona', 'Bette'), cls=ListItemLabel)
 
this is the list i want updated:
 BoxLayout:
                #size_hint: (.3, .75)
                DetailView:
                    id: detailBox
                    adapter: app.detailboxAdapter
                        #id:d_adapter
 
and this is the list with the selection change that i want to bind to:
 
 BoxLayout:
            detailBox: detailBox
            size_hint: (.4, 1)
            pos_hint: {'right': 1}
            #pos_hint: {'top': -1}
            MyList:
                id: mylist
                adapter: app.studentAdapter

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