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    <p>I solved this problem by creating a DelegateCommand class. It looks exactly like the RelayCommand (See Josh Smith), with the exception that it allows for updating the callbacks.</p> <pre><code>public class DelegateCommand : ICommand { Action&lt;object&gt; _execute; Predicate&lt;object&gt; _canExecute; #region Constructors public DelegateCommand() { } public DelegateCommand(Action&lt;object&gt; execute) : this(execute, null) { } public DelegateCommand(Action&lt;object&gt; execute, Predicate&lt;object&gt; canExecute) { if (execute == null) throw new ArgumentNullException("execute"); _execute = execute; _canExecute = canExecute; } #endregion // Constructors public void Delegate(Action&lt;object&gt; execute) { _execute = execute; } public void Delegate(Action&lt;object&gt; execute, Predicate&lt;object&gt; canExecute) { _execute = execute; _canExecute = canExecute; } #region ICommand Members [DebuggerStepThrough] public bool CanExecute(object parameter) { return _canExecute == null ? _execute != null : _canExecute(parameter); } public event EventHandler CanExecuteChanged { add { CommandManager.RequerySuggested += value; } remove { CommandManager.RequerySuggested -= value; } } public void Execute(object parameter) { if (CanExecute(parameter)) _execute(parameter); } #endregion // ICommand Members } </code></pre> <p>Then I created a class to hold static application commands.</p> <pre><code>public class CustomCommands { private readonly static DelegateCommand admin; static CustomCommands() { admin = new DelegateCommand(); } public static DelegateCommand AdminCommand { get { return admin; } } } </code></pre> <p>Then I added a key binding to the main window since user controls don't receive key gestures.</p> <pre><code>&lt;Window.InputBindings&gt; &lt;KeyBinding Key="A" Modifiers="Control" Command="my:CustomCommands.AdminCommand"/&gt; &lt;/Window.InputBindings&gt; </code></pre> <p>Then, in my ViewModel I can handle the event like this:</p> <pre><code>public class OfflineViewModel : ViewModelBase { public OfflineViewModel() { CustomCommands.AdminCommand.Delegate(ShowAdmin); } public override void Removed() { base.Removed(); ReleaseAdminCommand(); } public override void Hidden() { base.Hidden(); ReleaseAdminCommand(); } void HookAdminCommand() { CustomCommands.AdminCommand.Delegate(ShowAdmin); } void ReleaseAdminCommand() { // Remove handling CustomCommands.AdminCommand.Delegate(null, null); } void ShowAdmin(object parameter) { Navigation.Push(new AdminViewModel()); } } </code></pre> <p>Optionally I could use events inside the DelegateCommand.</p>
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