<DataGridTextColumn Header="{x:Static res:Resources.CDMN}" Width="15*" IsReadOnly="False" 
Visibility="{Binding Path=(FrameworkElement.DataContext), RelativeSource={x:Static RelativeSource.Self}, Converter={StaticResource visibilityConverter}}"
Binding="{Binding DataContext.IsCollect, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DockPanel}}}"	/>

public class VisibilityConverter : IValueConverter
	{
		public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
		{
			try
			{
				if (null != value || (Boolean.Parse(value.ToString()) && (bool)value)) 
					return System.Windows.Visibility.Visible;
			}
			catch { }

			return System.Windows.Visibility.Collapsed;

		}

		public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
		{
			throw new NotImplementedException();
		}
	}