Code

private void diagram_CellClicked(object sender, CellEventArgs e)
{
	TableNode table = e.Table;
	TableNode.Row row = table.Rows[e.Row];
	if (row.Header && e.Column == 1)
	{
		List<string> sectionData = GetSectionData(table, e.Row);
		sectionData.Sort();
		SetSectionData(table, e.Row, sectionData);
	}
}

List<string> GetSectionData(TableNode table, int headerRow)
{
	List<string> data = new List<string>();
	for (int i = headerRow + 1; i < table.RowCount; ++i)
	{
		if (table.Rows[i].Header)
			break;
		data.Add(table[0, i].Text);
	}
	return data;
}

TableNode TestSortTable()
{
	TableNode table = diagram.Factory.CreateTableNode(
		0, 0, 40, 150,// bounds
		2, 8);// columns x rows
	table[0, 0].Text = "header 1";
	table[0, 1].Text = "z";
	table[0, 2].Text = "y";
	table[0, 3].Text = "x";
	table[0, 4].Text = "header 2";
	table[0, 5].Text = "b";
	table[0, 6].Text = "c";
	table[0, 7].Text = "a";

	table.Rows[0].Header = true;
	table[1, 0].Image = sortIcon;
	table.Rows[4].Header = true;
	table[1, 4].Image = sortIcon;
	table.OffsetHeaderRows = true;
	return table;
}