File Dropping does not work

Hi

I try to enable file dropping on syntax editor WPF. I set AllowDrop=true and use the event PasteDropEvent:

private void editor_PasteDragDrop(object sender, PasteDragDropEventArgs e)
{
  if (e.Action == PasteDragDropAction.DragEnter)
    e.DragEventArgs.Effects = DragDropEffects.Copy;
  else if (e.Action == PasteDragDropAction.DragDrop && e.DataStore.GetDataPresent(DataFormats.FileDrop))
  {
    string[] files = e.DataStore.GetData(DataFormats.FileDrop) as string[];
    if (files != null && files.Length > 0)
    {
      using (FileStream stream = File.OpenRead(files[0]))
      {
        e.Text = new StreamReader(stream).ReadToEnd();
      }
    }
  }
}

It seems not to work in this way. I get the DragEnter event but no DragDrop. Similar code worked with the WinForms Syntax Editor. How can I implement this with WPF Syntax Editor?

Thanks in advance.

Martin