obtaining an object from a listBox bound to an ArrayList

I have an arrayList that I add several custom class objects to
CustomObj{
   private a;
   private b;

   public A{ get a }
   public B{ get b }
}

CustomObj o;
CustomObj 02;

ArrayList a;

a.add(o);
a.add(o2);

I bind a listBox to my ArrayList and the user selects an item from the list

listBox lb;

lb.DataSource = a;
lb.DisplayMember ="A";
lb.ValueMember ="B";

This works up to here.  How do my object out of the ListArray?

I want:
CustomObj o3 = a[lb.SelectedIndex];

a[lb.SelectedIndex] is of type Object.

Any help is appreciated.
WhatupEAsked:
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TheAvengerCommented:
Just change your code to:

CustomObj o3 = (CustomObj)lb.SelectedItem;
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