private void doSelectionChanged() {
StatusInfo status = new StatusInfo();
List selected = fHistoryList.getSelectedElements();
if (selected.size() != 1) {
status.setError(""); // $NON-NLS-1$
fResult = null;
} else {
fResult = (IModelElement) selected.get(0);
}
fHistoryList.enableButton(
0, fHistoryList.getSize() > selected.size() && selected.size() != 0);
fHistoryStatus = status;
updateStatus(status);
}
