protected void AppendNodesToData(DataObject data, IEnumerable<TreeNodeAdv> nodes)
{
data.SetData(nodes.ToArray());
data.SetContentRefs(
from c in nodes
where c.Tag is ResourceNode
select (c.Tag as ResourceNode).ResLink as IContentRef);
data.SetFiles(
from c in nodes
where c.Tag is NodeBase && !ContentProvider.IsDefaultContentPath((c.Tag as NodeBase).NodePath)
select (c.Tag as NodeBase).NodePath);
}