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copied!<p>I think it is because you are calling LoadComponent() on what is also your Main Window ( <a href="http://msdn.microsoft.com/en-us/library/system.windows.application.mainwindow.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.windows.application.mainwindow.aspx</a> ), i.e. the startup uri, in your case Window1. The program is probably entering some loop when you close it because closing a Main Window by default shuts down the Application and your two instances of Window1 are waiting on each other (A.K.A. a deadlock)! Albeit seemingly only after making the Application invisible (so it seems to have closed).</p> <p>If you still must use use LoadComponent() on Window1 I think you would need to not make it your startup uri by changing the StartupUri of your Application:</p> <pre><code><Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" StartupUri="Window1.xaml">  </Application> </code></pre> <p>Or change Application.ShutdownMode ( <a href="http://msdn.microsoft.com/en-us/library/system.windows.application.shutdownmode.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.windows.application.shutdownmode.aspx</a> ) to OnLastWindowClose:</p> <pre><code><Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" StartupUri="Window1.xaml" ShutdownMode="OnLastWindowClose"> </Application> </code></pre>

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