In the past we declared properties like this:
public class MyClass
{
private int _age;
public int Age
{
get{ return _age; }
You can't, it's a language feature as opposed to a IDE feature. To be honest i'd prefer then IDE to add the private variable in for you. I agree that it is slightly weird for the class to internally have to use the public entry point to access its own variables. Hence I don't use this new feature that much myself.