public interface IExtensionCommand : ICommand
{
    bool IsEnabled { get; set; }
    bool Visibility { get; set; }
    string Name { get; set; }
    string Caption { get; set; }
    object Content { get; set; }
    object Icon { get; set; }
    Key HotKey { get; set; }
    object Param { get; set; }
}

<Button>
    <i:Interaction.Behaviors>
        <behavior:CommandBehavior Command="{Binding ExtensionCommand}"
                                  RoutedEvent="Click"
                                  CommandParameter="{Binding CommandParameter}" />
    </i:Interaction.Behaviors>
</Button>