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    <p>The <code>CommandManager</code> doesn't exist in WinRT. You need to manually refresh listeners. Here's my example implementation of <code>DelegateCommand&lt;T&gt;</code> that illustrates this:</p> <pre><code>using System; using System.Windows.Input; public class DelegateCommand&lt;T&gt; : ICommand { private readonly Action&lt;T&gt; m_executeAction; private readonly Predicate&lt;T&gt; m_canExecutePredicate; public DelegateCommand(Action&lt;T&gt; executeAction) : this(executeAction, null) { } public DelegateCommand(Action&lt;T&gt; executeAction, Predicate&lt;T&gt; canExecutePredicate) { if (executeAction == null) { throw new ArgumentNullException("executeAction"); } m_executeAction = executeAction; m_canExecutePredicate = canExecutePredicate; } public event EventHandler Executed; public event EventHandler CanExecuteChanged; bool ICommand.CanExecute(object parameter) { return CanExecute((T)parameter); } void ICommand.Execute(object parameter) { Execute((T)parameter); } public bool CanExecute(T parameter) { var result = true; var canExecutePredicate = m_canExecutePredicate; if (canExecutePredicate != null) { result = canExecutePredicate(parameter); } return result; } public void Execute(T parameter) { m_executeAction(parameter); RaiseExecuted(); } public void Refresh() { RaiseCanExecuteChanged(); } protected virtual void RaiseExecuted() { var handler = Executed; if (handler != null) { handler(this, EventArgs.Empty); } } protected virtual void RaiseCanExecuteChanged() { var handler = CanExecuteChanged; if (handler != null) { handler(this, EventArgs.Empty); } } } </code></pre> <p>The WPF version of this class indirectly uses <code>CommandManager.InvalidateRequerySuggested</code> by implementing <code>CanExecuteChanged</code> as follows:</p> <pre><code>public event EventHandler CanExecuteChanged { add { CommandManager.RequerySuggested += value; } remove { CommandManager.RequerySuggested -= value; } } </code></pre> <p>However, in WinRT this is not supported and in my WinRT version any code that invalidates the state of the delegate command must call the <code>Refresh</code> method to cause bound items in the view to requery the command.</p> <p>I think the best solution to your specific problem would be to implement <code>INotifyPropertyChanged</code> in your view model. Invoking the <code>PropertyChanged</code> event on this interface is equivalent to my <code>Refresh</code> method and forces bound elements in the view to re-evaluate themselves and, thus, to re-run all associated <code>IValueConverter</code> instances.</p>
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