How to hook up OnClick event to WPF button inside ListBox <DataTemplate> from codebehind

I need to find a way to bind an event (OnClick) to a button that is part of a ListBox, inside the ListItem and DataTemplate. This is done from the C # scripting space inside another application that doesn't accept event binding from XAML code, but allows me to do the binding at runtime. For other controls that are not inside a data template like the lstSaveSetups ListBox, I use the LogicalTreeHelper, find the item I want and just bind it. It doesn't work here and I've also tried FindName unsuccessfully as well as many other approaches.

This is the XAML:

  <ListBox Name="lstSavedSetups" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" >
    <ListBox.ItemTemplate>
      <DataTemplate>
        <Grid>
          <Grid.ColumnDefinitions>
            <ColumnDefinition Width="50" />
            <ColumnDefinition Width="50" />
            <ColumnDefinition Width="25" />
          </Grid.ColumnDefinitions>
          <TextBlock Grid.Column="0" Text="{Binding 1stColumn}" />
          <TextBlock Grid.Column="1" Text="{Binding 2ndColumn}" />
          <Button Grid.Column="2" Name="btnDelete" />
        </Grid>
      </DataTemplate>
    </ListBox.ItemTemplate>
  </ListBox>      

      

        
        
        
      

    

Simplified C # code:

System.IO.FileStream fs = new System.IO.FileStream(System.IO.Path.Combine(myBaseDir, @"listBox.xaml"), System.IO.FileMode.Open);
System.Windows.Controls.Page page = (System.Windows.Controls.Page)System.Windows.Markup.XamlReader.Load(fs);

lstSavedSetups = LogicalTreeHelper.FindLogicalNode(page, "lstSavedSetups") as System.Windows.Controls.ListBox;

System.Windows.Controls.Grid.SetRow(lstSavedSetups, 16);
System.Windows.Controls.Grid.SetColumn(lstSavedSetups, 1);

myGrid.Children.Add(lstSavedSetups);
//the following works
lstSavedSetups.SelectionChanged += lstSavedSetups_SelectionChanged;

//one of many examples of what does not work:
System.Windows.Controls.Button btnDelete = lstSavedSetups.ItemTemplate.FindName("btnDelete", lstSavedSetups) as System.Windows.Controls.Button;

btnDelete.Click += btnDelete_OnClick;

      

        
        
        
      

    

I haven't included everything I've tried, but I'm starting to think that I've tried every solution I could find, but I haven't been able to get this to work.

What am I doing wrong? Any help would be really appreciated! Thank!

Libor