CheckListDisplay Click Behavier

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VB

I'm trying to have the Checklist change "checked states" every time you click on an Item in the list (Not only when you click into the Check box itself)
This seems a straight forward task but somehow it's given me trouble - is not behaving properly
I have obviously tried "tons" of different approaches using different handels - below is what I currently been using

If CheckListDisplay.SelectedIndex <> -1 Then

        
If CheckListDisplay.GetItemCheckState(CheckListDisplay.SelectedIndex) = CheckState.Checked Then

                CheckListDisplay.SetItemCheckState(CheckListDisplay.SelectedIndex, CheckState.Unchecked)
            Else

                CheckListDisplay.SetItemCheckState(CheckListDisplay.SelectedIndex, CheckState.Checked)
            End If
        End If
        CheckListDisplay.Refresh()

It always seems to work properly with brakes but if you run it without brake it start miss behaving :-) = You have to click twice - will only do it the first time you click an item and so on

Obviously I'm missing something

any Ideas