same propertypage in 2 dialogs? (one calling the other)

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i have a property*** with 3 pages:

______________________________________________________________
// in header Main***.h

CStandard m_standard;
CErweitert m_erweitert;
CListe m_liste;
______________________________________________________________
// in implementation Main***.cpp

CMain***::CMain***()
: CProperty*** (IDS_TITLE)
{
AddPage (&m_standard);
AddPage (&m_erweitert);
AddPage (&m_liste);
}

i have another dialog (CRecall) were i want to have the 2nd page
(m_erweitert) [btw: german for 'extended'] as a child inside a static
(m_REParent). this should work like this: the user pushes a button
inside page#1 'm_standard' (or page#0 if you prefer ;-)) and my 2nd
dialog pops up modaly, consisting of some controls and the whole page
#2 (or page#1 if you start at the zeroth) that works like this:

______________________________________________________________
// in header Recall.h

CErweitert * DlgErweitert;
bool fErweitertCreated;
______________________________________________________________
// in implementation Recall.cpp

CRecall::CRecall(CWnd* pParent /*=NULL*/)
: CDialog(CRecall::IDD, pParent)
{fErweitertCreated = false;}

BOOL CRecall::OnInitDialog() {
CDialog::OnInitDialog();

RECT rc;
m_REParent.GetWindowRect(&rc);
ScreenToClient(&rc);

if (! DlgErweitert->GetSafeHwnd()) {
//if user clicked on "recall" before
//he clicked on Property***.erweitert..
// if we dont check it, we get assertion-error
DlgErweitert->Create(IDD_ERWEITERT,this);
fErweitertCreated = true;
}
DlgErweitert->SetParent(this);
rc.left -= GetSystemMetrics(SM_CXBORDER);

DlgErweitert->ModifyStyle(WS_CAPTION|WS_DISABLED,WS_VISIBLE|WS_CLIPCHILDREN,1);
DlgErweitert->EnableWindow(true);
DlgErweitert->MoveWindow(&rc,true);
return false;
}

int CRecall::DoModal() {
int ret = CDialog::DoModal();
if (fErweitertCreated) DlgErweitert->DestroyWindow();
return ret;
}

however, when user clickes on the button that should bring up my 2nd
dialog (yes, we could call it my 1st if we call the other 0th ;-))
*before* m_erweitert was visible, i got faults until i added...

if (! DlgErweitert->GetSafeHwnd()) {
DlgErweitert->Create(IDD_ERWEITERT,this);
}

....to my dialog. so by now, the m_erweitert is shown independent of its
former creation. but then i had the problem that my dialog crashes
*after* i close it and click on the m_erweitert's tab or if i call my
2nd dialog a 2nd time.

i thought i should destroy (should i?) DlgErweitert in my CRecall *if*
i created it there (i store this in a bool) but now my m_erweitert is
gone after i call my CRecall.

so what should i do?

.

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