C / C++ / MFC

• Set the tab control's "transparent" bit (in the resource editor) to true.
  
  
• Call BringWindowToTop() followed by SetFocus() to properly show the selected modeless dialog.

/////////////////////////////////////////////////////////////////////////////
// CDlgHolding dialog
 
BEGIN_MESSAGE_MAP(CDlgHolding, CDialog)
	//{{AFX_MSG_MAP(CDlgHolding)
	ON_NOTIFY(TCN_SELCHANGE, TAB_CTRL, OnTabSelected)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()
 
/////////////////////////////////////////////////////////////////////////////
// CDlgHolding message handlers
 
BOOL CDlgHolding::OnInitDialog() 
{
	CDialog::OnInitDialog();
	
  // Initialize tab control
  CTabCtrl* pTabCtrl = (CTabCtrl *) GetDlgItem (TAB_CTRL);
  ASSERT (pTabCtrl != NULL);
  pTabCtrl->InsertItem (0, " Stock Holding ");
  pTabCtrl->InsertItem (1, " Cash Holding ");
  pTabCtrl->InsertItem (2, " Margin Debt ");
 
  // Create tabbed dialogs
  VERIFY (m_dlgStockHolding.Create (IDD_STOCK_HOLDING, this));
  VERIFY (m_dlgCashHolding.Create (IDD_CASH_HOLDING, this));
  VERIFY (m_dlgMarginHolding.Create (IDD_MARGIN_HOLDING, this));
  updateTabSelection();
 
  // Set focus to default tab
  m_dlgStockHolding.SetFocus();

  return FALSE; // return TRUE unless you set the focus to a control
                // EXCEPTION: OCX Property Pages should return FALSE
}
 
void CDlgHolding::OnTabSelected
  (NMHDR* pNMHDR, LRESULT* pResult) 
{
  // Set new current tab
  CTabCtrl* pTabCtrl = (CTabCtrl *) GetDlgItem (TAB_CTRL);
  ASSERT (pTabCtrl != NULL);
  long nCurrentTab = pTabCtrl->GetCurSel();
 
  // Hide all tabbed dialogs
  m_dlgStockHolding.ShowWindow (SW_HIDE);
  m_dlgCashHolding.ShowWindow (SW_HIDE);
  m_dlgMarginHolding.ShowWindow (SW_HIDE);
 
  // Get window of visible tabbed dialog
  CWnd* pWndCurrentTab = NULL;
  switch (nCurrentTab) {
    case 0:
      pWndCurrentTab = &m_dlgStockHolding;
      break;
    case 1:
      pWndCurrentTab = &m_dlgCashHolding;
      break;
    case 2:
      pWndCurrentTab = &m_dlgMarginHolding;
      break;
    default:
      ASSERT (FALSE);
      break;
  }
 
  // Resize and show dialog
  if (pWndCurrentTab != NULL) {
      CRect rectCtrl;
      GetDlgItem (FRAME_TAB_DIALOG)->GetWindowRect (&rectCtrl);
      ScreenToClient (&rectCtrl);

      pWndCurrentTab->MoveWindow (&rectCtrl, TRUE);
      pWndCurrentTab->ShowWindow (SW_SHOW);
      pWndCurrentTab->Invalidate();
      pWndCurrentTab->UpdateWindow();
      pWndCurrentTab->BringWindowToTop();
      pWndCurrentTab->SetFocus();
  }
 
  // Return normally
	*pResult = 0;
}
 
// End DlgHolding.cpp

GetDlgItem (FRAME_TAB_DIALOG)->GetWindowRect (&rectCtrl)

BOOL CDataManDlg::OnInitDialog() 
{
	CDialog::OnInitDialog();
	
	m_tabData.InsertItem (0, " Media Sales ");
	m_tabData.InsertItem (1, " Temp Garbage ");
	VERIFY (m_dlgSales.Create (IDD_MEDIASALES_DIALOG, this));
	m_dlgSales.SetFocus ();
		
	return FALSE;
}

void CDataManDlg::OnTabSelected(NMHDR* pNMHDR, LRESULT* pResult) 
{
	// Set a new current tab.
	int nCurrentTab = m_tabData.GetCurSel ();

	// Hide all the tabs.
	m_dlgSales.ShowWindow (SW_HIDE);

	// Get window of visible tabbed dialog.
	CWnd* pWndCurrentTab = NULL;
	switch (nCurrentTab) {
	case 0:
		pWndCurrentTab = &m_dlgSales;
		break;
	case 1:
		break;
	default:
		ASSERT (FALSE);
		break;
	}

	// Resize and show the dialog
	if (pWndCurrentTab != NULL) {
		CRect rectCtrl;
		GetDlgItem (FRAME_TAB_DIALOG)->GetWindowRect (&rectCtrl);
		ScreenToClient (&rectCtrl);

		pWndCurrentTab->MoveWindow (&rectCtrl, TRUE);
        pWndCurrentTab->ShowWindow (SW_SHOW);
		pWndCurrentTab->Invalidate ();
		pWndCurrentTab->UpdateWindow ();
		pWndCurrentTab->BringWindowToTop ();
		pWndCurrentTab->SetFocus ();
	}
	
	*pResult = 0;
}

pWndCurrentTab->MoveWindow (&rectCtrl, TRUE);
pWndCurrentTab->ShowWindow (SW_SHOW);
pWndCurrentTab->Invalidate();
pWndCurrentTab->UpdateWindow();
pWndCurrentTab->BringWindowToTop();
pWndCurrentTab->SetFocus();