ViewportLayer viewportLayer = new ViewportLayer(selectionLayer);
// build the column header layer
IDataProvider columnHeaderDataProvider = new DefaultColumnHeaderDataProvider(
propertyNames, propertyToLabelMap);
DataLayer columnHeaderDataLayer = new DefaultColumnHeaderDataLayer(
columnHeaderDataProvider);
ColumnHeaderLayer columnHeaderLayer = new ColumnHeaderLayer(
columnHeaderDataLayer, viewportLayer, selectionLayer);
ColumnGroupHeaderLayer columnGroupHeaderLayer = new ColumnGroupHeaderLayer(
columnHeaderLayer, selectionLayer, columnGroupModel);