Compare Pdf...

hi..
I want to execute the menu item "Documents " in adobe proffession 7.0,
i tried like this but its not working...
Like this

Code:

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ok = AcrobatApp.MenuItemExecute("DigSig:ToolsDiff")

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My problem is i cant able to fire the event.. this ok always returning False..
I don know how to proceed next.. is there any other way to do this,,,
Here is the code

Code:

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Function CompareTwoPdfFiles( _
        ByVal OldFileName As String, _
        ByVal NewFileName As String _
        ) As Boolean
    Screen.MousePointer = vbHourglass

    ' Initialize Acrobat by creating AcrobatApp object.
    ' If Acrobat is already running,
    ' it will get the existing acrobat object.
    Dim AcrobatApp As Acrobat.CAcroApp
    Set AcrobatApp = CreateObject("AcroExch.App")

    ' Show Acrobat (skip this for a background server).
    AcrobatApp.Show

    ' Is a PDF already open?
    Dim OpenPdfCount As Integer
    OpenPdfCount = AcrobatApp.GetNumAVDocs

    Dim DocumentWasOpen As Boolean
    DocumentWasOpen = (OpenPdfCount > 0)

    Dim ok As Boolean
    ok = True

    ' Open the "New" file first,
    ' so it appears on the right side in the comparison output.
    Dim NewPd As Acrobat.CAcroPDDoc
    Dim NewAv As Acrobat.CAcroAVDoc
    If ok Then
        Set NewPd = CreateObject("AcroExch.PDDoc")
        ok = NewPd.Open(NewFileName)
        If ok Then
            Set NewAv = NewPd.OpenAVDoc(NewFileName)
        Else
            Screen.MousePointer = vbNormal
            MsgBox "Could not open PDF file: " & NewFileName
        End If
    End If

    ' Open the "Old" file second,
    ' so it appears on the left side in the comparison output.
    Dim OldPd As Acrobat.CAcroPDDoc
    Dim OldAv As Acrobat.CAcroAVDoc
    If ok Then
        Set OldPd = CreateObject("AcroExch.PDDoc")
        ok = OldPd.Open(OldFileName)
        If ok Then
            Set OldAv = OldPd.OpenAVDoc(OldFileName)
        Else
            Screen.MousePointer = vbNormal
            MsgBox "Could not open PDF file: " & OldFileName
        End If
    End If

   If ok Then
        ok = AcrobatApp.MenuItemExecute("DigSig:ToolsDiff")
       
        If Not ok Then
            Screen.MousePointer = vbNormal
            MsgBox "Could not compare files"
        End If
    End If

    Dim NoSave As Boolean
    NoSave = True

    If ok Then
        Dim DiffAv As Acrobat.CAcroAVDoc
        Set DiffAv = AcrobatApp.GetActiveDoc

        Dim DiffPd As Acrobat.CAcroPDDoc
        Set DiffPd = DiffAv.GetPDDoc

        ok = DiffPd.Save(PDSaveFull, "c:\sample\Comparison.pdf")
        If Not ok Then
            Screen.MousePointer = vbNormal
            MsgBox "Could not save comparison output file"
        End If

        If Not (DiffAv Is Nothing) Then
            DiffAv.Close (NoSave)
            Set DiffAv = Nothing
        End If

        If Not (DiffPd Is Nothing) Then
            DiffPd.Close
            Set DiffPd = Nothing
        End If
    End If

    If Not (OldAv Is Nothing) Then
        OldAv.Close (NoSave)
        Set OldAv = Nothing
    End If

    If Not (OldPd Is Nothing) Then
        OldPd.Close
        Set OldPd = Nothing
    End If

    If Not (NewAv Is Nothing) Then
        NewAv.Close (NoSave)
        Set NewAv = Nothing
    End If

    If Not (NewPd Is Nothing) Then
        NewPd.Close
        Set NewPd = Nothing
    End If

    ' End Acrobat only if it was not existing before,
    ' or it was existing but no PDF file was open.
    If Not (AcrobatApp Is Nothing) Then
        If Not DocumentWasOpen Then
            AcrobatApp.CloseAllDocs
            AcrobatApp.Exit

            Set AcrobatApp = Nothing
        End If
    End If
    Screen.MousePointer = vbNormal
    CompareTwoPdfFiles = ok
End Function

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Try using:
MenuitemExecute(DIGSIG:CompareDocuments )