Android Question GetItemFromView in CustomListView

Hello,

I have to fix a small correction in the running APP, not developed by me. following senario: always at the last index in the last view (CheckBox) in the CustomListview the index gives me what was last clicked! I'm afraid it's the class library but it's not!
where can I look ?? Any Idea ?
thanks

Dim chk As CheckBox = Sender
Dim index As Int
index = clv2.GetItemFromView(chk)

Dim pnl As Panel
pnl = clv2.GetPanel(index)
Dim pnl1 As Panel = pnl.GetView(0)

chkJa = pnl1.GetView(1)
chkNein = pnl1.GetView(2)

If chkJa.Checked = True Then
chkNein.Checked = False