WPF: Binding a ContextMenu to an MVVM Command

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The problem is that the ContextMenu it not in the visual tree, so you basically have to tell the Context menu about which data context to use.

Check out this blogpost with a very nice solution of Thomas Levesque.

He creates a class Proxy that inherits Freezable and declares a Data dependency property.

public class BindingProxy : Freezable
{
    protected override Freezable CreateInstanceCore()
    {
        return new BindingProxy();
    }

    public object Data
    {
        get { return (object)GetValue(DataProperty); }
        set { SetValue(DataProperty, value); }
    }

    public static readonly DependencyProperty DataProperty =
        DependencyProperty.Register("Data", typeof(object), typeof(BindingProxy), new UIPropertyMetadata(null));
}

Then it can be declared in the XAML (on a place in the visual tree where the correct DataContext is known):

<Grid.Resources>
    <local:BindingProxy x:Key="Proxy" Data="{Binding}" />
</Grid.Resources>

And used in the context menu outside the visual tree:

<ContextMenu>
    <MenuItem Header="Test" Command="{Binding Source={StaticResource Proxy}, Path=Data.MyCommand}"/>
</ContextMenu>

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