Hi,
TreeView SoaRequestTag & SoaResponseTag properties will be available in the forthcoming service pack 1. In the meantime, you can use the following:
TreeView1.BeforeSoaRequestSent += new EventHandler(TreeView1_BeforeSoaRequestSent);
[...]
void TreeView1_BeforeSoaRequestSent(object sender, TreeViewSoaRequestCancelEventArgs e)
{
e.Request.Tag = myExtraData;
}