Add a button for each row in a listview

Question

I have a listview populated with data from database and a iwould like to add a button in the last column for each row displayed in the listview here is my XAML :

<ListView x:Name="listView" ItemsSource="{Binding}" HorizontalAlignment="Left" Height="520" Margin="27,57,0,0" VerticalAlignment="Top" Width="1133">
            <ListView.View>
                <GridView x:Name="gridView">
                    <GridViewColumn>
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <CheckBox Tag="{Binding fournisseur}" IsChecked="True"/>
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                    <GridViewColumn DisplayMemberBinding="{Binding fournisseur}" Width="280">
                        <GridViewColumn.Header>
                            <GridViewColumnHeader Tag="Fournisseur">Fournisseur</GridViewColumnHeader>
                        </GridViewColumn.Header>
                    </GridViewColumn>
                    <GridViewColumn DisplayMemberBinding="{Binding email}" Width="280">
                        <GridViewColumn.Header>
                            <GridViewColumnHeader Tag="Email">Email</GridViewColumnHeader>
                        </GridViewColumn.Header>
                    </GridViewColumn>
                    <GridViewColumn Header ="Date" DisplayMemberBinding="{Binding date}" Width="150"/>
                    <GridViewColumn Header="Fichier CSV" DisplayMemberBinding="{Binding files}" Width="370">
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <Button Tag="{Binding}" Content="Open File" Click="OpenFile_OnClick"/>
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                </GridView>
            </ListView.View>
        </ListView>

and here is my c# code where i fill my listview :  

TOPSAGEEntities db = new TOPSAGEEntities();
            var query = from fournisseur in db.F_COMPTET
                        join email in db.F_ECHEANCES on fournisseur.CT_Num equals email.CT_Num
                        where EntityFunctions.TruncateTime(email.cbModification) == EntityFunctions.TruncateTime(DatePicker.SelectedDate)
                        select new { fournisseur = (string)email.ECH_Intitule, email = (string)fournisseur.CT_EMail, date = (DateTime)email.cbModification};

            //List Data from Database into the ListView
            listView.DataContext = query.ToList().Distinct();

what's wrong with my code ?