mainColumn.setLabelProvider(new DecoratingStyledCellLabelProvider(
mainLabels, decorator, null));
TreeViewerColumn descriptionColumn =
newTreeViewerColumn(viewer, SWT.LEFT, "Description", 200);
ColumnLabelProvider descriptionLabels = new CommandDescriptionProvider();
descriptionColumn.setLabelProvider(descriptionLabels);
descriptionColumn.getColumn().addSelectionListener(
new TreeViewerColumnLabelSorter(viewer, descriptionLabels));
TreeViewerColumn durationColumn =