Bug 96928 [1.5][model] Creating enum failed with exception in project with source level at 1.4
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/wizards/NewTypeWizardPage.java
TypeSelectionDialog2 dialog= new TypeSelectionDialog2(getShell(), 
			false, getWizard().getContainer(), scope, IJavaSearchConstants.TYPE);
		dialog.setTitle(NewWizardMessages.NewTypeWizardPage_ChooseEnclosingTypeDialog_title); 
		dialog.setMessage(NewWizardMessages.NewTypeWizardPage_ChooseEnclosingTypeDialog_description); 
		dialog.setFilter(Signature.getSimpleName(getEnclosingTypeText()));
		
		if (dialog.open() == Window.OK) {	
			return (IType) dialog.getFirstResult();
		}
		return null;
	}	
	
	private IType chooseSuperType() {
		IPackageFragmentRoot root= getPackageFragmentRoot();
		if (root == null) {
			return null;
		}	
		
		IJavaElement[] elements= new IJavaElement[] { root.getJavaProject() };
		IJavaSearchScope scope= SearchEngine.createJavaSearchScope(elements);
		TypeSelectionDialog2 dialog= new TypeSelectionDialog2(getShell(), false,
			getWizard().getContainer(), scope, IJavaSearchConstants.CLASS);
		dialog.setTitle(NewWizardMessages.NewTypeWizardPage_SuperClassDialog_title); 
		dialog.setMessage(NewWizardMessages.NewTypeWizardPage_SuperClassDialog_message); 
		dialog.setFilter(getSuperClass());
		if (dialog.open() == Window.OK) {
			return (IType) dialog.getFirstResult();
		}
		return null;
	}