Looping thru Workbooks problem

Can someone explain why this code generates "Object doesn't support this property or method" error?

Sub LoopThruWkBooksWkSheets()
Dim wb as WorkBook
Dim ws as WorkSheet

For Each wb In Workbooks
For Each ws In Worksheets
wb.ws.Cells.ColumnWidth = 3 ----> error line
Next
Next
End Sub

The idea is to loop through all open workbooks and all worksheets therein to reset the columnwidths to 3. The above code can be tweaked to work by activating each Workbook as in:

Sub LoopThruWkBooksWkSheets()
Dim wb as WorkBook
Dim ws as WorkSheet

For Each wb In Workbooks
wb.activate
For Each ws In Worksheets
ws.Cells.ColumnWidth = 3
Next
Next
End Sub

...but this is arguably not elegant even by turning off screenupdating.


TIA

David