I'm usinin the following code to highlight the filtered column with a
different collar.
To make it works I've entered =Now() in some cell.
Everything is fine. But, when I'm opening another spreadsheet the procedure
is being automatically triggered producing the error "out of range".

Private Sub Worksheet_Calculate()
Dim af As AutoFilter
Dim fFilter As Filter
Dim iFilterCount As Integer
'Application.EnableEvents = False
If Worksheets("Initiatives").AutoFilterMode Then ' gettin an error "out of
range"
Set af = Worksheets("Initiatives").AutoFilter
iFilterCount = 1
Worksheets("Initiatives").Unprotect ("donit")
For Each fFilter In af.Filters
If fFilter.On Then
af.Range.Cells(1, iFilterCount) _
.Interior.ColorIndex = 3 ' 15 - gray; 35 - mint green
Else
af.Range.Cells(1, iFilterCount) _
.Interior.ColorIndex = 15
End If
iFilterCount = iFilterCount + 1
Next fFilter

Else
Worksheets("Initiatives").Range("A1").AutoFilter
Worksheets("Initiatives").Range("A1:H1").Interior. ColorIndex = 15
End If

How could I fix it?

Thanks