protected override void OnValidating( CancelEventArgs e )
{
base.OnValidating( e );
errorProvider1.SetError(this.NodeListControl1, "" );
if (this.NodeListControl1.Items.Count < 2)
{
errorProvider1.SetError(lblError, "A minimum of 2 nodes are required." );
tabControl1.TabPages[0].BackColor = Color.LightCoral;
e.Cancel = true;
}
}