🚀 go-pugleaf

I am using the same function as another program i wrote which alternates row
colors in a listeview, in the other program it works fine..
the one i am currently doing does not get past the below msg..
if (lpnm->hdr.code == NM_CUSTOMDRAW)

the only difference between the two programs is the listview that works fine
is placed upon a form directly, whereas this one that i am having trouble
with is place upon a TabSheet which in turn is on a PageControl.

void __fastcall TMainForm::WMNotify(TMessage &Msg)
{
    LPNM_LISTVIEW lpnm = (NM_LISTVIEW *)Msg.LParam;
           // see if the message is a Custom Draw message
          // ****************    This is as far as it gets
*************************
    if (lpnm->hdr.code == NM_CUSTOMDRAW)
    {
        // see if the message is from the ListView
        if (lpnm->hdr.hwndFrom == MyListView->Handle)

any idea's  thanks in advance