private void buttonAddDomain_Click(object sender, EventArgs e)
{
IMainForm mainForm = Instances.MainForm;
// Jump to the domains node.
SearchNodeType crit = new SearchNodeType(typeof(NodeDomains));
mainForm.SelectNode(crit);
// Show the new domain.
NodeDomain domain = new NodeDomain(mainForm, 0, null);
mainForm.ShowItem(domain);
}