private void b_save_Click(object sender, EventArgs e)
{
protocol = new Protocol(tb_title.Text, tb_source.Text, tb_description.Text);
tv = new TreeView();
tv.Size = p_newlayers.Size;
tv.Location = p_newlayers.Location;
tv.HideSelection = false;
tv.Nodes.Add("block", protocol.getName(), protocol.getSource(), protocol.getDescription());
tv.SelectedNode = tv.Nodes[0];
tv.BackColor = SystemColors.ActiveCaption;
tv.BorderStyle = BorderStyle.Fixed3D;
p_newlayers.Controls.Add(tv);
p_newprotocol.Hide();
p_newlayers.Show();
l_protocolName.Text = protocol.getName();
l_protocolDesc.Text = protocol.getDescription();
p_add_new_data.Show();
}