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        private void treeFile_MouseUp(object sender, MouseEventArgs e)
        {
            treeFile.ContextMenuStrip = contextMenuNodes;
            treeFile.SelectedNode = treeFile.GetNodeAt(e.X, e.Y);
            if (e.Button == MouseButtons.Right)
            {
                contextMenuNodes.Show(e.X, e.Y);
            }
        }					

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            if (e.Button == MouseButtons.Right)
            {
                TreeNode tn = e.Node;
                tn.ContextMenuStrip = contextMenuNodes;
            }					

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treeView1.SelectedNode = treeView1.GetNodeAt(e.Location);