protected void HandleTreeViewDragBegin(object o, Gtk.DragBeginArgs args)
{
Gdk.Pixmap pm = treeView.CreateRowDragIcon(treeView.Selection.GetSelectedRows()[0]);
Gdk.Pixbuf pb = Gdk.Pixbuf.FromDrawable(pm, pm.Colormap, 0, 0, 0, 0, -1, -1);
Gtk.Drag.SetIconPixbuf(args.Context, pb, 0, 0);
}
