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
* Sets the enclosing type checkbox's selection state.
	 * 
	 * @param isSelected the checkbox's selection state
	 * @param canBeModified if <code>true</code> the enclosing type checkbox is
	 * modifiable; otherwise it is read-only.
	 */
	public void setEnclosingTypeSelection(boolean isSelected, boolean canBeModified) {
		fEnclosingTypeSelection.setSelection(isSelected);
		fEnclosingTypeSelection.setEnabled(canBeModified);
		updateEnableState();
	}
	
	/**
	 * Returns the type name entered into the type input field.
	 * 
	 * @return the type name
	 */
	public String getTypeName() {
		return fTypeNameDialogField.getText();
	}
	/**
	 * Sets the type name input field's text to the given value. Method doesn't update
	 * the model.
	 * 
	 * @param name the new type name
	 * @param canBeModified if <code>true</code> the enclosing type name field is
	 * editable; otherwise it is read-only.
	 */	
	public void setTypeName(String name, boolean canBeModified) {
		fTypeNameDialogField.setText(name);