SendMessage problem...

[Wokawidget]

I have created my own ActiveX EXE now...I have subclassed a form in this...
And I have the following in a standard EXE:

Public Function SendByteArray(ByVal hWnd As Long, ByVal ByteArray As String) As Long
Dim lngRet      As Long
    marBuffer = ByteArray
    With mudtStruct
        .Length = UBound(marBuffer) + 1
        .Pointer = VarPtr(marBuffer(0))
    End With
    SendByteArray = SendMessage(hWnd, CUSTOM_MESSAGE, GetCurrentProcessId, mudtStruct)
    Erase marBuffer
End Function
 
Public Sub PostByteArray(ByVal hWnd As Long, ByVal ByteArray As String)
    marBuffer = ByteArray
    With mudtStruct
        .Length = UBound(marBuffer) + 1
        .Pointer = VarPtr(marBuffer(0))
    End With
    Call PostMessage(hWnd, CUSTOM_MESSAGE, GetCurrentProcessId, VarPtr(mudtStruct))
End Sub

Now...while in design mode and running the active x exe app from the IDE I can SendByte Array to the activeX...this isn't a problem...however...if I compile the ActiveX EXE then run the above code the SendByte array function fails...the ActiveX doesn't even pick up the custom message, and so ALWAYS returns a 0 for the pointer value, however, the POSTMessage does work...but I need SendMessage...
Why is this?

Woka