Private Sub Worksheet_BeforeDoubleClick(ByVal Target As Range, Cancel As Boolean)
Cancel = True
With ActiveCell
ActiveSheet.CheckBoxes.Add(.Offset(0, 1).Left - 15, .Top, .Height / 2, .Height / 2).Select
Selection.Name = "Cbx_" & .Address(False, False)
Selection.Caption = ""
.Select
End With
End Sub