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copied!<p>even if you use queries in the back you still could use binding (and why not) - you just have to fire the proper INotifyPropertyChanges as a result of one ComboBox-Changing (and with it the bound values in your ViewModel) - like this:</p> <pre><code>public string SelectedStoreName { get { return _storeName; } set { if (!Equals(value, _storeName)) { _storeName = value; _currentStore = FindStore(value); OnPropertyChanged("SelectedStoreName"); // invokes INotifyPropertyChanged OnPropertyChanged("AvaiableAisles"); } } } public IEnumerable<Aisles> AvaiableAisles { get { return _currentStore.StoreAisles.ToArray(); } } /* same with the rest of your chain */ </code></pre> <p>Please Note a few things:</p> <ul> <li><code>SelectedStoreName</code> should be bound to your Store-Combobox if you don't like the string part change it (but I see no need)</li> <li><code>AvaiableAisles</code> should be bound to the Itemsource of your Aisles-Combobox - you will need a ItemTemplate or the right <code>.ToString()</code> overload in <code>Aisles</code> to show the content you like. If you don't like this approach change <code>AvaiableAisles</code> with a <code>.Select(...)</code> before the <code>.ToArray()</code> to select a string and change the signature into <code>IEnumerable<string> AvaiableAisles</code></li> <li>I did not mind any error handling for example using <code>_currentStore</code></li> <li>you have to Implemet INotifyPropertyChanged if you don't have allready</li> <li>you have to implement the <code>FindStore</code> - this is where the query-part is</li> </ul>

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