@Override
            public TickBoxState getValue(final TaskProgress taskProgress) {
                if (TaskProgressUtil.DEAD_TASK_NAME.equals(taskProgress.getTaskName())) {
                    // Dead tasks cannot be deleted so don't show a checkbox
                    // They are only there to show that an orphaned child task was a child of something
                    return null;
                } else {
                    return TickBoxState.fromBoolean(selectedTaskProgress.contains(taskProgress));
                }
            }
Add the columns to the table.
stroom-core-client/src/main/java/stroom/task/client/presenter/TaskManagerListPresenter.java