Add a button for each row in a listview

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">FournisseurGridViewColumnHeader>
GridViewColumn.Header>
GridViewColumn>
<GridViewColumn DisplayMemberBinding="{Binding email}" Width="280">
<GridViewColumn.Header>
<GridViewColumnHeader Tag="Email">EmailGridViewColumnHeader>
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 ?