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    <p>The problem you encounter comes from the way, WPF manages the shutdown.</p> <p><strong>You can change the shutdown-behaviour</strong> through the ...</p> <pre><code>Application.Current.ShutdownMode </code></pre> <p>... property. Change it to an approriate value:</p> <pre><code>Application.Current.ShutdownMode = System.Windows.ShutdownMode.OnLastWindowClose; </code></pre> <p>this will help.</p> <p><strong>Another way</strong> is to set manually the <code>MainWindow</code>-property to your second window.</p> <p>If you want to make a <strong>splashscreen</strong> only, use the splashscreen option that is available since .net 3.51. IT has the advantage that it is loaded very early in the application loading sequence, much earlier that a window can. </p> <p>To do that, open the properties-tab of an image in your project-explorer and set the <strong>Build Action</strong> to <strong>SplashScreen</strong></p> <hr> <p><strong>Update</strong></p> <p>In one of my apps I had a design that also had to show a modal dialog before showing the main window. At this time I didn't knew about the <code>ShutdownMode</code>-property.</p> <p>What I did was I first started a <code>Window</code> that was invisible to the user. This was the first window and it also controled app-livetime (default behaviour of WPF). Out from this window I opened the desired dialog (a window that was showed modal). If this dialog has completed unsuccessfull, I terminated the hidden window and the app completetely closed. If the dialog resulted ok, I created the first MainWindow-instance, the user can work with.</p>
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    1. CONo, both didn't help. But it seems, I've ruled out this situation. I'm Hiding About window and it helps for some reason.
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    2. COI think you have to remove the StartupURI and open the form manually. However what you are describing is also a possible way (I used it also for an alike problem). But only as a suggesion, if your only desire is to show an about information on application startup, think about using the splash-screen-option. It is showed at the very start of the application, before loading the fat assemblies and therefore its use leads to a much better user-experience for your app.
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    3. CONo, the About dialog is just an example, sorry for misleading. It will be LogonDialog.
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