metric.setTitleOrientation(TitleOrientation.TOP);
metric.setValueField("id");
metric.setDisplayField("displayName");
metric.setOptionDataSource(new ResourceScheduledMetricDatasource());
resourceGroupSelector.addAssignedItemsChangedHandler(new AssignedItemsChangedHandler() {
public void onSelectionChanged(AssignedItemsChangedEvent event) {
if (resourceGroupSelector.getSelection().size() == 1) {
metric.fetchData();