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copied!<p>According to the first question I posted, using CommandBindings in listbox it doesn't work. The implementation of CanExecute was:</p> <pre><code> private void CommandBinding_CanExecute(object sender, CanExecuteRoutedEventArgs e) { e.CanExecute = !cBgWorkers.isRunning; } </code></pre> <p>By doing WPF doesn't enable/disabled the listbox control automatically depending on the background worker state (Running or not) and I don't understand why because I have other controls like buttons with commands binded and WPF automatically enable/disable them.</p> <p>So I have done the following modification:</p> <pre><code> private void CommandBinding_CanExecute(object sender, CanExecuteRoutedEventArgs e) { e.CanExecute = !cBgWorkers.isRunning; if (LayoutListBox != null) LayoutListBox.IsEnabled = !cBgWorkers.isRunning; } </code></pre> <p>Now, it works. Listbox is enable when no background worker is running and disabled otherwise bu what I don't like is the last line placed into the method in where I enable/disable manually the property isEnabled of the listbox. It is inefficient so I would like to change isEnabled property of the listbox only when CanExecute changes its value. As far as I know there is a event to do this, it is CanExecuteChanged but I don't know how to implement it. Any ideas?</p> <p>Now, after trying several solutions, I am implementing the Mike's solution because I think it is easier and clearer and it can be re-used for other controls with only a few changes.</p>

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