Sub CheckBox1_Click()
Dim index As Int = clv1.GetItemFromView(Sender)
Log($" Checkboxx ${index+1} has been clicked ... "$)
'uncheck other checkbox /s
For i = 0 To clv1.Size -1
If i <> index Then
Dim p As B4XView = clv1.GetPanel(i)
Dim chk As B4XView = p.GetView(2) '@@ assuming checkbox is 3rd view in panel
chk.Checked = False
End If
Next
End Sub