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TreeView tv;
tv.AfterSelect += new TreeViewEventHandler(tv_AfterSelect);
//Button: tv.SelectedNode = tv.SelectedNode.NextVisibleNode;
//Button: tv.SelectedNode = tv.SelectedNode.PrevVisibleNode;
}
void tv_AfterSelect(object sender, TreeViewEventArgs e)
{
e.Node.ExpandAll();
}