Bug 171262 [Dialogs] uncaught NPE in FilteredResourcesSelectionDialog
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/dialogs/FilteredResourcesSelectionDialog.java
setSubtitle(workingSet.getLabel());
							} else {
								IWorkbenchWindow window = PlatformUI
										.getWorkbench()
										.getActiveWorkbenchWindow();
								if (window != null) {
									IWorkbenchPage page = window
											.getActivePage();
									workingSet = page.getAggregateWorkingSet();
									if (workingSet.isAggregateWorkingSet()
											&& workingSet.isEmpty()) {
										workingSet = null;
									}
								}
								workingSetFilter.setWorkingSet(workingSet);
								setSubtitle(null);
							}
							scheduleRefresh(true);
						}
					}
				});
		menuManager.add(new Separator());
		workingSetFilterActionGroup.fillContextMenu(menuManager);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.dialogs.FilteredItemsSelectionDialog#createExtendedContentArea(org.eclipse.swt.widgets.Composite)
	 */
	protected Control createExtendedContentArea(Composite parent) {