mouse scroll operation

Question

i have a listviewitem where list of items are there: like AAA BBB CCC by default on form load first item (AAA) is selected (focused). Now, when i scroll down the mouse i want the focus should go to second item(BBB), again i scroll down mouse i want the focus should go to the third item(CCC). And when i scroll up focus should come from the last item to the first item one by one. how to do this. i dont think any scroll event is there in mouse operation. i ma using windows application with C#. please help me if you guys can. regards, bhargob