[dba-VB] C# - How to access objects in inherited list

Just to learn how, I am trying to subclass a generic list class.

My grade calculator previously dimensioned a list and used it.  The syntax to access objects in the 
list in that case was MyList{MyIndex].

In my class definition I subclassed my Grades to inherit the list class.

     class clsGrades: List <clsGrade>
     {
     }

Now I need to replace all of the code that previouly referenced MyList[].  However I cannot for the 
life of me figure out the syntax.  This[] does not work.  [] by itself does not work.  What is the 
name of the list property that [] references?

TIA

-- 
John W. Colby
www.ColbyConsulting.com