DatagridColumnHeader Drag implementation overides ColumnSorting Funcionality?

Hello guys,

   Im working on a project that requires me to drag a columnheader of a datagrid outside the datagrid domain and put it into a another container so i can do stuff with it later. No problems so far... until.. i noticed that the "userscansortcolumns" funcionality (that is ofc set to true) not work becouse of the previous implementation i said.

  I got something like this to drag the header to outside the datagrid:

<DataGrid.Resources><Style TargetType="DataGridColumnHeader"><EventSetter Event="PreviewMouseLeftButtonDown" Handler="dataGrid_PreviewMouseLeftButtonDown"/><EventSetter Event="PreviewMouseMove" Handler="dataGrid_PreviewMouseMove"/></Style></DataGrid.Resources>

and the c#:

public System.Windows.Point startPoint { get; set; }

private void dataGrid_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            startPoint = e.GetPosition(null);
        }


private void dataGrid_PreviewMouseMove(object sender, MouseEventArgs e)
        {
            if (IsDragging(startPoint, e))
            {   
      DragDrop.DoDragDrop((DataGridColumnHeader)sender,  new DataObject(sender.GetType().Name, sender), DragDropEffects.Copy);
             e.Handled = true;
            }
        }

private bool IsDragging(System.Windows.Point dragStartPoint, MouseEventArgs e)
        {
            var diff = e.GetPosition(null) - startPoint;
            return
                e.LeftButton == MouseButtonState.Pressed &&
                (Math.Abs(diff.X) > SystemParameters.MinimumHorizontalDragDistance ||
                 Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance);
        }

With this code the drag and drop works just fine to outside the datagrid and into my other component, the problem is that the property of the datagrid (dataGrid.CanUserSortColumns = true) does not work cause of the code above as well as the  column resize funcionality of the datagrid.

Any ideas so i can achive both behaviours (sorColumns and drag them off)?

Sory about the English ;)