drbdArchWidget.setEnabled(false);
getProgressBar().start(20000);
final ExecCommandThread t = getHost().execCommand(new ExecCommandConfig()
.commandString("DrbdAvailVersions")
.convertCmdCallback(getDrbdInstallationConvertCmdCallback())
.execCallback(new ExecCallback() {
@Override
public void done(final String answer) {
final String[] items = answer.split(NEWLINE);
/* all drbd versions are stored in form
* {version1,version2,...}. This will be