columnGroupHeaderLayer.addColumnsIndexesToGroup("Group 1", 1, 2);
columnGroupHeaderLayer.addColumnsIndexesToGroup("UnBreakable group 2",
4, 5, 6, 7);
columnGroupHeaderLayer.addColumnsIndexesToGroup("UnBreakable group 3",
8, 9, 10);
columnGroupHeaderLayer.addColumnsIndexesToGroup("Group 4", 11, 12, 13);
columnGroupHeaderLayer.addColumnsIndexesToGroup("Group 5", 14, 15, 16,
17);
columnGroupHeaderLayer.setGroupUnbreakable(4);
columnGroupHeaderLayer.setGroupUnbreakable(8);
columnGroupHeaderLayer.setGroupAsCollapsed(11);