VS C# 2005 ListViews not holding background color

Question

I have created a listview in my C# form and when i add an item through my code I change the background color of my cells/rows.  However, when i scroll over them at runtime the color defaults back to white and then they stay white.  I have different tab pages in my form.  If I switch to a different tab page and then come back the colors will be back where they were until they are selected or scrolled over again.  Is this simply a glitch in VS?  I have no idea how to fix it.  When I items into the listview I am using the following code.

ListViewItem li = new ListViewItem(le.TimeStamp.ToString());

//Allows us to use different fonts, backgroud colors, etc. for individual items within a row on the

//list view and for entire rows themselves

li.UseItemStyleForSubItems = false;

string mt = "";

//depending on the type of message that is being logged to the case tab a color indicator is chosen

//to be displayed in the "Indicator" column

switch(le.MessageType)

{

//display a green indicator bar and a message for "Informational"

   case "Informational":

{

mt = "Informational";

li.SubItems.Add(mt);

li.SubItems.Add("");

li.SubItems.Add(le.Message);

li.SubItems[2].BackColor = Color.Green;

CaseLogListView.Items.Add(li);

break;

}