Bug 39244 modifiersChanged() hook not called in NewTypeWizardPage [code manipulation]
The modifiersChanged() hook in NewTypeWizardPage is not being called when a modifier radio-button is selected (public/default/private/protected), it is only being called if a check box is selected (abstract/final/static). I suspect a missing "else if" clause in typePageDialogFieldChanged() in NewTypeWizardPage is the culprit. As such am unable to extend NewTypeWizardPage and validate modifier settings (working on custom "class" wizard extension).
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/wizards/NewTypeWizardPage.java
private IPackageFragment choosePackage() {
		IPackageFragmentRoot froot= getPackageFragmentRoot();
		IJavaElement[] packages= null;
		try {
			if (froot != null && froot.exists()) {
				packages= froot.getChildren();
			}
		} catch (JavaModelException e) {
			JavaPlugin.log(e);
		}
		if (packages == null) {
			packages= new IJavaElement[0];
		}
		
		ElementListSelectionDialog dialog= new ElementListSelectionDialog(getShell(), new JavaElementLabelProvider(JavaElementLabelProvider.SHOW_DEFAULT));
		dialog.setIgnoreCase(false);
		dialog.setTitle(NewWizardMessages.getString("NewTypeWizardPage.ChoosePackageDialog.title")); 
		dialog.setMessage(NewWizardMessages.getString("NewTypeWizardPage.ChoosePackageDialog.description")); 
		dialog.setEmptyListMessage(NewWizardMessages.getString("NewTypeWizardPage.ChoosePackageDialog.empty")); 
		dialog.setElements(packages);
		IPackageFragment pack= getPackageFragment();
		if (pack != null) {
			dialog.setInitialSelections(new Object[] { pack });
		}
		if (dialog.open() == ElementListSelectionDialog.OK) {
			return (IPackageFragment) dialog.getFirstResult();
		}
		return null;