Private Sub Worksheet_BeforeDoubleClick(ByVal T As Range, Cancel As Boolean)
If Not Intersect(T, Range("c15", Cells(Rows.Count, 3).End(3))) Is Nothing And T.Count = 1 And T <> "" Then _
Cells(T.Row, 2).Resize(, 8).Interior.ColorIndex = IIf(T.Interior.Color = RGB(255, 128, 255), xlNone, RGB(255, 128, 255))
T.Offset(, -1).Select
End Sub