Private Sub Worksheet_Change(ByVal Target As Range)
Dim KeyCells As Range
Set KeyCells = Range("A1")
If Not Application.Intersect(KeyCells, Range(Target.Address)) _
Is Nothing Then
If Range("A1") = "Yes" Then
Rows("2:11").Select
Selection.EntireRow.Hidden = False
Range("A1").Select
End If
End If
End Sub