GridViewColumn.cs

public class GridViewColumn : DependencyObject
{
    public static readonly DependencyProperty ColumnWidthProperty =
        DependencyProperty.RegisterAttached("ColumnWidth", typeof(GridLength), typeof(GridViewColumn), new PropertyMetadata(new GridLength(1, GridUnitType.Star),OnWidthChanged));

    private static readonly Dictionary<GridView, Dictionary<System.Windows.Controls.GridViewColumn, GridLength>> GridViews = new Dictionary<GridView, Dictionary<System.Windows.Controls.GridViewColumn, GridLength>>();


    /// <summary>
    /// Sets the value of the attached property ScrollGroup.
    /// </summary>
    /// <param name="obj">Object on which the property should be applied.</param>
    /// <param name="gridLength">Value of the property.</param>
    public static void SetColumnWidth(DependencyObject obj, GridLength gridLength)
    {
        obj.SetValue(ColumnWidthProperty, gridLength);
    }

    /// <summary>
    /// Gets the value of the attached property ScrollGroup.
    /// </summary>
    /// <param name="obj">Object for which the property should be read.</param>
    /// <returns>Value of the property StartTime</returns>
    public static GridLength GetColumnWidth(DependencyObject obj)
    {
        return (GridLength)obj.GetValue(ColumnWidthProperty);
    }

    /// <summary>
    /// Occurs, when the ScrollGroupProperty has changed.
    /// </summary>
    /// <param name="d">The DependencyObject on which the property has changed value.</param>
    /// <param name="e">Event data that is issued by any event that tracks changes to the effective value of this property.</param>
    private static void OnWidthChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var column = d as System.Windows.Controls.GridViewColumn;

        //throw new NotImplementedException("message");
        
        //
        //var gridView = column.LogicalAncestors().OfType<GridView>().First();
        //var panel = gridView.LogicalAncestors().OfType<Panel>().First();
        //column.
        //if (column != null)
        //{
        //    if (!((GridLength)e.NewValue).IsStar)
        //    {
        //        // Remove scrollviewer
        //        if (GridViews.ContainsKey(column))
        //        {
        //            column.ScrollChanged -= new ScrollChangedEventHandler(ScrollViewer_ScrollChanged);
        //            GridViews.Remove(column);
        //        }
        //    }

        //    if (!string.IsNullOrEmpty((string)e.NewValue))
        //    {
        //        // If group already exists, set scrollposition of new scrollviewer to the scrollposition of the group
        //        if (HorizontalScrollOffsets.Keys.Contains((string)e.NewValue))
        //        {
        //            column.ScrollToHorizontalOffset(HorizontalScrollOffsets[(string)e.NewValue]);
        //        }
        //        else
        //        {
        //            HorizontalScrollOffsets.Add((string)e.NewValue, column.HorizontalOffset);
        //        }

        //        if (VerticalScrollOffsets.Keys.Contains((string)e.NewValue))
        //        {
        //            column.ScrollToVerticalOffset(VerticalScrollOffsets[(string)e.NewValue]);
        //        }
        //        else
        //        {
        //            VerticalScrollOffsets.Add((string)e.NewValue, column.VerticalOffset);
        //        }

        //        // Add scrollviewer
        //        GridViews.Add(column, (string)e.NewValue);
        //        column.ScrollChanged += new ScrollChangedEventHandler(ScrollViewer_ScrollChanged);
        //    }
        //}
    }
}