Unable to hide row Excel 2003 from function invoked from formula - excel

Question

I have this very simple function
Public Function HRows(xx As String)
BeginRow = 2
EndRow = 10
' HideRows
For RowCnt = BeginRow To EndRow
Cells(RowCnt,ChkCol).EntireRow.Hidden = True
Next RowCnt
End Function
When invoked from a command button it works fine, when invoked as a formula, e.g =HRows(A1), from a worksheet cell it doesn't do anything on Excel 2003, it does work in Open Office Calc 4.1
This happens on an otherwise empty spreadsheet - no protection, no comments, no shapes (which have been suggested as inhibitors in other questions)
Eventually, I want to hide/show the relevant sections of a spreadsheet, depending on what the user enters in certain key cells - I don't want to have to add command buttons to control the hiding.

Answer 1

I've already introduced this method here https://stackoverflow.com/a/23232311/2165759, for your purpose a code will be as follows:
Place code to one of the module of VBAProject:
Public Tasks, PermitNewTasks, ReturnValue
Function HideRowsUDF(lBegRow, lEndRow) ' Use this UDF on the sheet
If IsEmpty(Tasks) Then TasksInit
If PermitNewTasks Then Tasks.Add Application.Caller, Array(lBegRow, lEndRow)
HideRowsUDF = ReturnValue
End Function
Function HideRows(lFrom, lUpTo) ' actually all actions performed within this function, it runs without UDF limitations
Range(Rows(lFrom), Rows(lUpTo)).EntireRow.Hidden = True
HideRows = "Rows " & lFrom & "-" & lUpTo & " were hidden"
End Function
Sub TasksInit()
Set Tasks = CreateObject("Scripting.Dictionary")
ReturnValue = ""
PermitNewTasks = True
End Sub
Place code to ThisWorkbook section of Microsoft Excel Objects in VBAProject:
Private Sub Workbook_SheetCalculate(ByVal Sh As Object)
Dim Task, TempFormula
If IsEmpty(Tasks) Then TasksInit
Application.EnableEvents = False
PermitNewTasks = False
For Each Task In Tasks
TempFormula = Task.FormulaR1C1
ReturnValue = HideRows(Tasks(Task)(0), Tasks(Task)(1))
Task.FormulaR1C1 = TempFormula
Tasks.Remove Task
Next
Application.EnableEvents = True
ReturnValue = ""
PermitNewTasks = True
End Sub