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PODataGrid and Cell-Level ComboBoxes
 

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    <h2>Scenario</h2> <p>ComboBox C depends on the selected value of ComboBox B, which depends on the selected value of ComboBox A. All of these ComboBoxes are in a DataGrid.</p> <p>Common Road Blocks:</p> <ol> <li>The User must be able to add new rows (This Requires a ItemsSource item type that has a parameterless constructor).</li> <li>To access the database to populate the List of Available Options for the Comboboxes, the current project would require the Database Credentials/DataContext be passed into the Constructor.</li> </ol> <h2>Attempt 1</h2> <p>I've tried using 3 CollectionViewSources, one for each of the ComboBoxes (<a href="http://bea.stollnitz.com/blog/?p=387" rel="nofollow noreferrer">Concept Code Here</a>), but the SelectedItem of the ComboBox gets automatically selected in the other DataGrid rows. I need to find a way to isolate the CollectionViewSource to each row. </p> <p>I've considered just adding the CollectionViewSource data to each of the DataGrid Items so I can just bind to it that way, but I have to access the database to generate the CollectionViewSource. </p> <p>I also tried not sharing the CollectionViewSource as seen in <a href="https://stackoverflow.com/questions/5159893/binding-with-collectionviewsource">this question</a>, but that destroyed the link between the 3 ComboBoxes, as well as the Rows. If I could just set the CollectionViewSources to be shared within each DataGrid Row and not between each of them, I think it would work. I just can't find a way to do that.</p> <h2>Attempt 2</h2> <p>I've looked at this question: <a href="https://stackoverflow.com/questions/3843617/how-to-get-cell-level-combobox-for-wpf-datagrid">How to get cell level ComboBox for WPF DataGrid?</a> </p> <p>This would work, but the User needs to be able to add rows to the DataGrid. The example code in that question also uses a parameterless constructor. I am in a situation where access to the database to populate the lists would have to be passed into the constructor.</p> <h2>The Question</h2> <p>How do I do this correctly?</p>
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