private void buttonOk_Click(object sender, EventArgs e)
{
node.Nodes.Add("", textBoxName.Text, RessourceManager.GetExtension(textBoxPath.Text));
node.Nodes[node.Nodes.Count - 1].Tag = Path.AbsoluteToRelative(textBoxPath.Text);
node.Nodes[node.Nodes.Count - 1].ContextMenuStrip = contextMenu;
Dispose();
}