final Combo threadCombo = new Combo(composite, SWT.SINGLE | SWT.BORDER );
final String[] threads = new String[] { "1", "2", "4", "8"};
for (int i = 0; i < threads.length; i++) threadCombo.add(threads[i]);
int numThreads = ( (CrawlConfigWizard) getWizard()).crawlConfig.getNumThreads();
switch (numThreads)
{ case 1: threadCombo.select(0); break;
case 2: threadCombo.select(1); break;
case 4: threadCombo.select(2); break;
case 8: threadCombo.select(3); break;
}