XML Documentation for Master Page Methods

I have created several methods with XML documentation and posted them on our main page.

Intellisense is not picking up my XML documentation. If I have the same method in the class I am working in, it works fine.

In the example code below, if it's on my main page, intellisense returns ...

"bool Test (string str)".

If I have this in my local class I get two lines ...

bool Test (string str)
This is a test method.

How do I get XML documentation when a method is on the main page?

/// <summary>
/// This is a test method
/// </summary>
/// <param name="str">string to check</param>
/// <returns>true or false</returns>
public static Boolean Test (string str)
{
  ...
}