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POReferencing controls in a WPF DataTemplate
 

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    <p>In a WPF page that I'm designing for my church, I have two ListBox controls bound to the results of two Linq-to-Entities queries: the first listbox/query contains all the folks who haven't yet pledged for the year, the second listbox/query contains all the folks who have pledged (and their associated pledges). Specifically:</p> <pre><code>var familiesWithNoPledges = from family in entities.Family.Include("Pledge") where !family.Pledge.Where(p =&gt; p.PledgeYearID == pledgeYear).Any() select family; var familiesWithPledges = from family in entities.Family join pledge in entities.Pledge.Include("PledgeFrequency").Where(p =&gt; p.PledgeYearID == pledgeYear) on family equals pledge.Family select new { family, pledge }; </code></pre> <p>When the user of the application selects a family from the first ListBox, the ListBox item expands slightly to show the fields for a pledge, so that it's easy to add the pledge details to the second ListBox. It looks something like this:</p> <p><a href="http://wouldbetheologian.com/images/PledgeManager.jpg" rel="nofollow noreferrer">http://wouldbetheologian.com/images/PledgeManager.jpg</a> <a href="http://wouldbetheologian.com/images/PledgeManager.jpg" rel="nofollow noreferrer">(Offsite Image)</a></p> <p>The underlying database (among other things) has a "Family" table with a 1:many relationship to a "Pledge" table. And when the user clicks the "Add Pledge" button, I'd like to create the new Pledge instance, save it to the database, and then refresh the two controls.</p> <p>But I can't figure out how to do that. If I try to do it in the code-behind, it doesn't seem like the event handler for the (n-instances of the) "Add Pledge" button can reference the controls in question; and in XAML, if I try to bind the ListBoxItem DataTemplate controls to the Family.Pledge (or Family.Pledge.FirstOrDefault()) fields, those fields are still empty when I look at the current Family object in the event handler for the Add Pledge button.</p> <p>Any thoughts on how to solve this? Or is there a better UI model I should look at altogether?</p> <p>Thanks in advance.</p>
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