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    <p>I think as <a href="https://stackoverflow.com/users/1849109/sa-ddam213">sa-ddam213</a> have suggested and I too believe that you are executing a code block in background <a href="http://msdn.microsoft.com/en-us/library/system.threading.thread.aspx" rel="nofollow noreferrer">Thread</a> or <a href="http://msdn.microsoft.com/en-us/library/system.threading.tasks.task.aspx" rel="nofollow noreferrer">Task</a>.</p> <p><strong>I think problem is that</strong><br> - On button click, start execution in background.<br> - You have kept a flag for checking if background process is running for <code>CanExecute()</code> for the Button's <code>Command</code>.<br> - UI checks <code>CanExecute()</code> for the Button's <code>Command</code> for a while then does not as mentioned in another question here - <a href="https://stackoverflow.com/questions/2281566/is-josh-smiths-implementation-of-the-relaycommand-flawed">Is Josh Smith's implementation of the RelayCommand flawed?</a>.<br> - Process returns in background.<br> - UI does not knows the background process is completed and as it has stopped checking the <code>CanExecute()</code> for the Button's <code>Command</code>, UI will not come to know itself.. (you need to tell it)<br> - Therefore UI is not responding but when user will click somewhere in the application or do an in-out as you said, it will back again.</p> <p><strong>Solution</strong><br> - By using <a href="http://msdn.microsoft.com/en-us/library/system.windows.input.commandmanager.invalidaterequerysuggested.aspx" rel="nofollow noreferrer">InvalidateRequerySuggested</a> method you can invoke the command requery on UI thread so UI will recheck the <code>CanExecute()</code> for each <code>Control</code> and/or <code>Button</code> <code>Command</code>.</p> <pre><code>// Forcing the CommandManager to raise the RequerySuggested event CommandManager.InvalidateRequerySuggested(); </code></pre> <blockquote> <p>The <a href="http://msdn.microsoft.com/en-us/library/system.windows.input.commandmanager.invalidaterequerysuggested.aspx" rel="nofollow noreferrer">InvalidateRequerySuggested</a> method forces the <a href="http://msdn.microsoft.com/en-us/library/ms616838(v=vs.100).aspx" rel="nofollow noreferrer">CommandManager</a> to raise the RequerySuggested event. The RequerySuggested event informs a command source to query the command it is associated with to determine whether or not the command can execute.</p> </blockquote> <p>For more refer:<br> - <a href="https://stackoverflow.com/a/2764022/468718">How does CommandManager.RequerySuggested work?</a><br> - <a href="http://msdn.microsoft.com/en-us/library/ms616838(v=vs.100).aspx" rel="nofollow noreferrer">MSDN - CommandManager</a><br> - <a href="http://msdn.microsoft.com/en-us/library/system.windows.input.commandmanager.invalidaterequerysuggested.aspx" rel="nofollow noreferrer">MSDN - CommandManager.InvalidateRequerySuggested Method</a> </p>
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    1. CODo you mean the CanExecute() is released by GC as [here](http://stackoverflow.com/questions/2281566/is-josh-smiths-implementation-of-the-relaycommand-flawed), so UI stops checking?
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    2. COHave you tried executing `CommandManager.InvalidateRequerySuggested();` on UI Dispatcher instance after the background process finishes.. ?
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    3. COI tried but didn't work. ` var syncContext = DispatcherSynchronizationContext.Current; if (null == syncContext) syncContext = SynchronizationContext.Current; syncContext.Post( (state) => { CommandManager.InvalidateRequerySuggested(); }, null);`
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