Private Sub Worksheet_BeforeDoubleClick(ByVal Target As Range, Cancel As Boolean)
If Target <> "R" Then Exit Sub
Target.Interior.ColorIndex = IIf(Target.Interior.ColorIndex = 3, 0, 3)
Target.Font.ColorIndex = IIf(Target.Interior.ColorIndex = 3, 2, 0)
Target(2, 1).Select
End Sub