Bug 20446 cannot create protected or private interfaces [code manipulation]
F3 the spec allows creating protected or private nested interfaces but eclipse disallows it (the new interface wizard)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/wizards/NewTypeWizardPage.java
public void changeControlPressed(DialogField field) {
			typePageChangeControlPressed(field);
		}
		
		
		public void customButtonPressed(ListDialogField field, int index) {
			typePageCustomButtonPressed(field, index);
		}
		
		public void selectionChanged(ListDialogField field) {}
		
		
		public void dialogFieldChanged(DialogField field) {
			typePageDialogFieldChanged(field);
		}
		
		public void doubleClicked(ListDialogField field) {
		}
	}
	
	private void typePageChangeControlPressed(DialogField field) {
		if (field == fPackageDialogField) {
			IPackageFragment pack= choosePackage();	
			if (pack != null) {