Inherited class event is not fired - vb.net

Question

First of all, this is my very first question in this community. Please give me some advice if I did it in the wrong way.
I need a little bit help. I am actually working on a BMEcat class library, BMEcat is a data exchange format for electronic catalogs. Anything works fine, but I realized that there is a memory problem while processing very large files. Because of this, I want to send an event for any processed article/product instead of creating a huge structure in memory.
This is the point where my problem begins.
I have a class CTRANSACTION, from which the classes CT_NEW_CATALOG, CT_UPDATE_PRODUCTS and CT_UPDATE_PRICES are derived.
In the base class CTRANSACTION there is an event defined:
Public Event Transaction_OnNewArticle(ByVal sender As Object, ByVal e As ArticleEventArgs)
The class CBMECAT has the variable
Public WithEvents TRANSACTION As CTRANSACTION
and the event handler
Private Sub TRANSACTION_Transaction_OnNewArticle(sender As Object, e As ArticleEventArgs) Handles TRANSACTION.Transaction_OnNewArticle
'...
End Sub
Because I cannot send the event Transaction_OnNewArticle from the derived CT_NEW_CATALOG class I let it call the TransactionEventOnNewArticle method instead, which is defined in CTRANSACTION. TransactionEventOnNewArticle then calls RaiseEvent Transaction_OnNewArticle.
Everything works wonderful, but the event Transaction_OnNewArticle is not fired. Is there a way to fix it?
Public MustInherit Class CTRANSACTION
Inherits CBMECAT_NODE
Public Event Transaction_OnNewArticle(ByVal sender As Object, ByVal e As ArticleEventArgs)
Public Sub TransactionEventOnNewArticle(ByVal sender As Object, ByVal e As ArticleEventArgs)
RaiseEvent Transaction_OnNewArticle(sender, e)
End Sub
Public Class CT_NEW_CATALOG
Inherits CTRANSACTION
Public Overrides Sub EventOnNewArticle(ByVal sender As Object, ByVal e As ArticleEventArgs)
TransactionEventOnNewArticle(sender, e)
End Sub
Public Class CBMECAT
Inherits CBMECAT_NODE
Public WithEvents TRANSACTION As CTRANSACTION
Private Sub TRANSACTION_Transaction_OnNewArticle(sender As Object, e As ArticleEventArgs) Handles TRANSACTION.Transaction_OnNewArticle
'THIS method is never called - why?
End Sub
End Class
UPDATE
Public Class CBMECAT_ELEMENT
Public Overridable Sub EventOnNewArticle(ByVal sender As Object, ByVal e As ArticleEventArgs)
End Sub
'Please notice that CBMECAT_ELEMENT is the base class of EVERY other class in the library.
'There is a class CBMECAT_NODE, which represents every node of the BMEcat XML structure and is derived from CBMECAT_ELEMENT.
'In CBMECAT_NODE is EventOnNewArticle called whenever an article is processed;
Public Class CBMECAT_NODE
Inherits CBMECAT_ELEMENT
Public Overridable Function CreateChildNode(ByRef Nodename As String, Optional ByRef Parent As CBMECAT_NODE = Nothing) As CBMECAT_ELEMENT
Select Case Nodename
[..]
Case ELEMENT_ARTICLE
CreateChildNode = New CARTICLE(Parent)
Dim e As New ArticleEventArgs With
{
.ARTICLE = CreateChildNode
}
EventOnNewArticle(Me, e)
[..]
UPDATE
Public Class CARTICLE
Inherits CBMECAT_NODE
Public Sub New(ByRef Father As CBMECAT_NODE)
[..]
Public Overrides Sub Read()
[..]
Public Overrides Sub Write()
[..]
Public Overrides Sub Validate()
[..]
UPDATE
Calling sequence:
CBMECAT_NODE.CreateChildNode calls CT_NEW_CATALOG.EventOnNewArticle <- OK
CT_NEW_CATALOG.EventOnNewArticle calls CTRANSACTION.TransactionEventOnNewArticle <- OK
CTRANSACTION.TransactionEventOnNewArticle fires Event Transaction_OnNewArticle
but this event is not received by the event handlier in CBMECAT
If I fire the event manually from a method in CTRANSACTION the event IS received by the event handler.
I also experimentet with AddHandler/RemoveHandler, but this also did not work.

Answer 1

Thank you, Visual Vincent, for helping me to focus the problem and to solve it. In deed it was "a little bit" complicated.
Class CBMECAT had the following read method:
Public Overrides Sub Read()
MyBase.Read()
GetContent(HEADER, ELEMENT_HEADER)
Select Case TransactionType
Case TransactionTypes.T_NEW_CATALOG
GetContent(TRANSACTION, ELEMENT_T_NEW_CATALOG)
Case TransactionTypes.T_UPDATE_PRICES
GetContent(TRANSACTION, ELEMENT_T_UPDATE_PRICES)
Case TransactionTypes.T_UPDATE_PRODUCTS
GetContent(TRANSACTION, ELEMENT_T_UPDATE_PRODUCTS)
Case Else
ReportError(ERROR_BMECAT_UNKNOWN_TRANSACTION_TYPE)
End Select
Validate()
End Sub
MyBase.Read reads the complete XML file and while reading it, the events should be fired. But at this moment the variable TRANSACTION is not assigned by it´s value. This is done by calling GetContent after the reading process has finished.
I have changed to:
TRANSACTION = New CT_NEW_CATALOG
TRANSACTION.Read()
Now all events are fired as expected.
I will remove TransactionEventOnNewArticle() from CBMECAT_ELEMENT. Thanks again, Vincent, for your suggestion. :-)