Cannot find the static member on the type

I have an application with external windows.  This application is complete, I am just revising it.  I have hit a snag and can't figure out why it is different when I copy/paste code and change the references and such. 

I have a drop down menu item "Maintain Disks"  with the Command Binding.

Am I missing something? 

<CommandBinding Command="{x:Static view:uclMainWindow.ShowMaintainDisksWindow}"
                    CanExecute="CanExecuteDisplayMaintainDisksWindow"
                    Executed="DisplayMaintainDisksWindow" /><MenuItem Header="Maintain Disks..."
                  Visibility="{Binding IsCurrentUserAdministrator, Converter={local:BooleanToVisibilityConverter}}"
                  Command="{x:Static view:uclMainWindow.ShowMaintainDisksWindow}" />

Xaml ^

 /// <summary>
  /// Converts a boolean value to the appropriate Visibility setting.
  /// </summary>
  public class BooleanToVisibilityConverter : MarkupExtension, IValueConverter
  {
    private static BooleanToVisibilityConverter _converter = null;

    /// <summary>
    /// Supplies a value to XAML
    /// </summary>
    /// <param name="serviceProvider"></param>
    /// <returns>an instance of the converter class
    /// </returns>
    public override object ProvideValue(IServiceProvider serviceProvider)
    {
      if (_converter == null) _converter = new BooleanToVisibilityConverter();
      return _converter;
    }

    #region IValueConverter Members

    /// <summary>
    /// Converts a boolean value to the appropriate Visibility setting.
    /// </summary>
    /// <returns>Visible if the supplied boolean value is true.  Collapsed if false.  (Returns the opposite value if
    /// the supplied parameter is not null.)</returns>
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
      if (value != null && (bool)value == true)
      {
        return (parameter == null) ? Visibility.Visible : Visibility.Collapsed;
      }
      else
        return (parameter == null) ? Visibility.Collapsed : Visibility.Visible;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
      return null;
    }

    #endregion
  }

 /// <summary>
    /// Call the Disks Maintenance Window
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void DisplayMaintainDisksWindow(object sender, ExecutedRoutedEventArgs e)
    {
      try
      {
        ViewModelMainWindow dataContext = (ViewModelMainWindow)this.DataContext;
        dataContext.DisplayMaintainDisksWindow();
      }
      catch (Exception ex)
      {
        App.DisplayErrorMessage(null, null, ex);
      }
    }

    /// <summary>
    /// Determines whether the Diagnostics menu option is available.
    /// </summary>
    ///<param name="sender">a reference to the control that triggered the event</param>
    /// <param name="e">the arguments associated with the CanExecute event</param>
    private void CanExecuteDisplayMaintainDisksWindow(object sender, CanExecuteRoutedEventArgs e)
    {
      e.CanExecute = true;
    }

Code Behind

 public void DisplayMaintainDisksWindow()
    {
      LoaderService.ShowChildWindow(new ViewModelMaintainDisks());
    }