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    <p>Yes. Implement the interface INotifyPropertyChanged. </p> <p>An example: </p> <p>MainWindow.xaml</p> <pre><code>&lt;Window x:Class="INotifyChangedDemo.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"&gt; &lt;Grid&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="*"&gt;&lt;/RowDefinition&gt; &lt;RowDefinition Height="*"&gt;&lt;/RowDefinition&gt; &lt;/Grid.RowDefinitions&gt; &lt;Label Content="{Binding HitCount}"&gt;&lt;/Label&gt; &lt;Button Grid.Row="1" Click="Button_Click"&gt; Hit &lt;/Button&gt; &lt;/Grid&gt; </code></pre> <p></p> <hr> <p>MainWindow.xaml.cs</p> <pre><code>namespace INotifyChangedDemo { /// &lt;summary&gt; /// Interaction logic for MainWindow.xaml /// &lt;/summary&gt; public partial class MainWindow : Window { private MainViewModel _viewModel = new MainViewModel(); public MainWindow() { InitializeComponent(); DataContext = _viewModel; } private void Button_Click(object sender, RoutedEventArgs e) { _viewModel.HitCount = _viewModel.HitCount + 1; } } } </code></pre> <hr> <p>MainViewModel.cs</p> <pre><code>namespace INotifyChangedDemo { public class MainViewModel : INotifyPropertyChanged { private int _hitCount; public int HitCount { get { return _hitCount; } set { if (_hitCount == value) return; _hitCount = value; // Notify the listeners that Time property has been changed if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs("HitCount")); } } } public event PropertyChangedEventHandler PropertyChanged; } } </code></pre> <p>For better implementation of INotifyChangedProperty, please refer to this thread: <a href="https://stackoverflow.com/questions/527602/automatically-inotifypropertychanged">Automatically INotifyPropertyChanged</a>.</p> <p>If you wanna know more about the MVVM pattern, please see here: <a href="http://msdn.microsoft.com/en-us/magazine/dd419663.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/magazine/dd419663.aspx</a></p>
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    1. COThanks for the great example! It seems like that works great if you use WPF bindings that tie a UI element to a certain property. What would happen if you weren't using bindings and didn't care in particular about a single property changing, but instead about anything at all changing about the model's state. Also, when the change occurs, I'm more interested in being able to execute a certain action on the UI (such as popping a message box) rather than updating the value of an element on the screen. Is that at all possible?
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    2. CO@glitch:The main window can listen to the PropertyChanged event of the view model, so that when PropertyChanged is fired, the main window could open a dialog. This is the simplest solution and you need to wire up the events in every view.
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    3. COMy approach to the message box problem was to have user controls which renders like message boxes where their visibility is bound to a property in the view model. Any how, overlaying of the control has to be worked out.
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Guidance
A row detail

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.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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