>TBH I don't know why Michel has implemented it this way. If a parent class has a default method I would assume that that should be used unless overridden.
>And if it is not a virtual method on the base class then defining an interface for the method would make it easier (and faster) to check.
>Perhaps Michel will give us more of an insight into this ?

The framework class has it like this:

    Public Overridable Function InitializeWithRow() As Boolean
        Return True
    End Function

The client class, optionally, can use it if necessary like this:

    Public Overrides Function InitializeWithRow() As Boolean

        ' Put something in here

        Return True
    End Function

In that particular framework overridable method design, if the DataEntry framework class has a primary key, I need to validate a few things in the framework class before allowing the call to the cilent class. So, this goes like this:

        ' The following could be a simple call to InitializeWithRow() as this is an overridable method. However,
        ' because InitializeWithRow() should be used only when we have a primary, thus oRow would be available,
        ' we are using it like that to verify first if the method exists in the client class. If yes, we verify
        ' first to see if we have a primary key. If yes, we continue with the call to the method. Otherwise,
        ' we redirect the user to the domain as this means the user manipulated the URL by removing the Session
        ' or the primary key.

        ' If the method exists in the client class
        If loReflection.IsMethodExistInSubClass(Me, "InitializeWithRow") Then

            ' If we have a primary key
            If nPrimaryKey > 0 Then

                ' Initialization code with row
                If Not InitializeWithRow() Then
                    Return False
                End If

            Else

                ' If the primary key is mandatory
                If lPrimaryKeyIsMandatory Then

                    ' If we are using an ID on entry to locate a record on the table but we are adding
                    If lSwitchFromUpdateToAdd Then
                    Else
                        oProcess.RedirectMain(oProcess.cHttp)
                    End If

                End If

            End If

        End If