TreeView node only works one time

I have this treeview menu with this code : TreeNode treeNode4 = new TreeNode("Importação CT-I", array5); treeView1.Nodes.Add(treeNode4); TreeNode nodeusu1 = new TreeNode("Usuários"); TreeNode nodeusu2 = new TreeNode("Servers"); TreeNode nodeusu3 = new TreeNode("Permissões"); TreeNode nodeusu4 = new TreeNode("Alterar Senha"); TreeNode nodeusu5 = new TreeNode("Sobre"); TreeNode nodeusu6 = new TreeNode("Encerrar"); TreeNode[] array6 = new TreeNode[] { nodeusu1, [...]

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