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    <p>Using MVVM, for functionality like this, we work with the view model rather than the views. First add a property of the same type as the items in the <code>ComboBox</code> control... I'm going to assume that they are <code>string</code> values for simplicity's sake:</p> <pre><code>private string selectedItem = string.Empty; ... public string SelectedItem { get { return selectedItem; } set { selectedItem = value; NotifyPropertyChange("SelectedItem"); // &lt;&lt; Implement INotifyPropertyChanged UpdateGrid(); } } </code></pre> <p>Now add a collection property for your <code>DataGrid</code>:</p> <pre><code>private ObservableCollection&lt;string&gt; items = new ObservableCollection&lt;string&gt;(); ... public ObservableCollection&lt;string&gt; Items { get { return items; } set { items= value; NotifyPropertyChange("Items"); // &lt;&lt; Implement INotifyPropertyChanged } } </code></pre> <p>Now let's look at that <code>UpdateGrid</code> method:</p> <pre><code>private void UpdateGrid() { // Update your property that is bound to the DataGrid.ItemsSource here Items = GetNewData(); // &lt;&lt; You need to implement this method yourself } </code></pre> <p>Now, in XAML:</p> <pre><code>&lt;DataGrid ItemsSource="{Binding Items}" /&gt; &lt;ComboBox ItemsSource="{Binding YourCollectionNotShownHere}" SelectedItem="{Binding SelectedItem}" /&gt; </code></pre> <p>Now whenever the <code>ComboBox.SelectedItem</code> changes, the <code>SelectedItem</code> property setter will be called and that will call the <code>UpdateGrid()</code> method, which will update the <code>Items</code> collection property and that will update the collection in the <code>DataGrid</code>. As the comment in the example said, you <em>will</em> need to implement the <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged.aspx" rel="nofollow"><code>INotifyPropertyChanged</code></a> interface in your view model.</p>
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    1. COThat is exactly how I have it set up. The grid does not populate and it is returning records. If I set the initial grid to display records associated with one of my lists it populates fine. Select something from combo box it hits the code but grid does not update. In winforms you could do a refresh. Not with WPF. I found a link which basically reloads the app which in essence redraws it. Unless I find a better answer here I am going to give it a shot. here is the link btw. http://www.codeproject.com/Articles/158591/Resetting-a-View-Model-in-WPF-MVVM-applications-wi
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    2. COGood grief...I forgot to raise the OnPropertyChanged event for my collection....thanks for your help
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    3. COIt's good to see that you persisted with your problem. If your problem is now solved, please [accept the answer that you believe is the best solution to your problem](http://stackoverflow.com/help/someone-answers) to let other users know what helped solve the question problem.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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