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<p>Thanks, Andrew, that did it. The key was that I had to create a separate DataContext for the DockPanel in question, and then bound it to a new instance of the Pledge object created higher up in the template.</p> <pre><code><ListBox> <ListBox.ItemTemplate> <DataTemplate> <Grid> <Grid.Resources> <local:Pledge x:Key="pledge" /> </Grid.Resources> <DockPanel DataContext="{Binding Source={StaticResource pledge}}" > <TextBox Name="txtAmount" Text="{Binding Path=Amount}" /> <TextBox Name="txtEnvelopeID" Text="{Binding Path=EnvelopeID}" />  <Button Tag="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=DataContext}" Name="addPledge" Click="addPledge_Click" > Add Pledge --> </Button> </DockPanel> </Grid> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </code></pre> <p>I still needed to know more details to setup the Pledge object appropriately, but I was able to get them by binding the Button's Tag property to the DataContext of its templated parent:</p> <pre><code><Button Tag="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=DataContext}" Name="addPledge" Click="addPledge_Click" /> </code></pre> <p>And from there, I was able to handle the rest in code-behind:</p> <pre><code> private void addPledge_Click(object sender, RoutedEventArgs e) { try { // Set any additional necessary properties. Button button = (Button)sender; Pledge pledge = (Pledge)button.DataContext; pledge.PledgeYear = (PledgeYear)cboYear.SelectedItem; pledge.Family = (Family)button.Tag; // Update the database and refresh the Listboxes. entities.AddToPledge(pledge); entities.SaveChanges(); LoadUnpledgedListBox(); LoadPledgedListBox(); } catch (System.Data.UpdateException ex) { MessageBox.Show("Error updating database: " + ex.Message); } catch (System.Exception ex) { Classes.Utils.HandleGenericError(ex); } } </code></pre> <p>Many thanks -- that pointed me in the right direction.</p>
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