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    <p>You can create Observables from existing events. You can use Observable.FromEvent for this purpose. You may write a GetMouseDown event wrapper like this, as an extension method for a UI Element.</p> <pre><code> public static IObservable&lt;Event&lt;MouseButtonEventArgs&gt;&gt; GetMouseDown (this UIElement el) { var allevents = Observable.FromEvent&lt;MouseButtonEventHandler, MouseButtonEventArgs&gt; ( h =&gt; new MouseButtonEventHandler(h), h =&gt; el.MouseDown += h, h=&gt; el.MouseDown -= h ); return allevents; } </code></pre> <p>And later, you may 'handle' your event in a completely declarative manner. Like</p> <pre><code>//create an observable declaratively var mouseDowns=button.GetMouseDown(); //subcribe and do what ever you need mouseDowns.Subscribe(arg=&gt; MessageBox.Show(arg.ClickCount.ToString()) ); </code></pre> <p>And here is how to create a 'drag' observable, with the intial position and current position.</p> <pre><code> //Get the initial position and dragged points using LINQ to Events var mouseDragPoints = from md in e.GetMouseDown() let startpos=md.EventArgs.GetPosition(e) from mm in e.GetMouseMove().Until(e.GetMouseUp()) select new { StartPos = startpos, CurrentPos = mm.EventArgs.GetPosition(e), }; //And subscribe here to mouseDragPoints </code></pre> <p>Read this article <a href="http://amazedsaint.blogspot.com/2009/11/linq-to-events-more-on-net-reactive.html" rel="nofollow noreferrer">LINQ to Events - More on .NET Reactive Extensions</a> and play with the source code.</p>
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    1. POIs it possible to replace traditional event handling in C# with the new Reactive framework?
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    1. CONote, you can code up your own IObservable and IObserver implementations in C#3.0, but unfortunately you can't use the syntax above for FromEvent, because of the CS1911 warning (http://msdn.microsoft.com/en-us/library/ms228459.aspx)
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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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