title: override itemsource property in listbox c#.net
body: <p>i m inheriting ListBox to my class and i want to override itemsource property.</p>
  
  <p>i actually want to do someoperation when itemsource is assigned.</p>
  
  <p>how it is possible?</p>
  
  <p>i want in c# code only not in xaml</p>