Как к определённой вкладке TabControl привязать Edit/RichEdit?

TabControl = new Wnd (WS_EX_OVERLAPPEDWINDOW, WC_TABCONTROLA, NULL, WS_CHILD | 
WS_VISIBLE, ParentWindow->rcClient.left,ParentWindow->rcClient.top,ParentWindow->rcClient.right,
ParentWindow->rcClient.bottom-20,ParentWindow->hWnd,0, hInstance, NULL);
 
    tabitem.mask = TCIF_TEXT; 
    tabitem.iImage = -1;
 
    tabitem.pszText="Untitled";
    TabCtrl_InsertItem(TabControl->hWnd,tN,&tabitem);
 
    
NumStr = new Wnd(NULL,"RICHEDIT",NULL,WS_CHILD | WS_VISIBLE | ES_NUMBER | ES_LEFT |
ES_MULTILINE, ParentWindow->rcClient.left+6,ParentWindow->rcClient.top+30,40,
ParentWindow->rcClient.bottom-77,TabControl->hWnd,0,0,0);
 
    ::SendMessage(NumStr->hWnd,EM_SETBKGNDCOLOR,0, RGB(253,245,230));
    CHARFORMAT cFORMAt;
    ZeroMemory(&cFORMAt, sizeof(cFORMAt));
    cFORMAt.cbSize = sizeof(CHARFORMAT);
    cFORMAt.dwMask = CFM_SIZE | CFM_FACE | CFM_COLOR | CFM_CHARSET;
    cFORMAt.crTextColor = RGB(255,140,105);
    cFORMAt.bPitchAndFamily = FW_THIN;
    lstrcpy(cFORMAt.szFaceName , "a HuxleyCaps");
    ::SendMessage(NumStr->hWnd,EM_SETCHARFORMAT,0,(LPARAM)&cFORMAt);
 
HEdit = new Wnd(WS_EX_ACCEPTFILES,WC_EDIT,NULL,WS_CHILD | WS_VISIBLE | WS_HSCROLL |
WS_VSCROLL | ES_LEFT | ES_MULTILINE | ES_AUTOHSCROLL |ES_AUTOVSCROLL,
ParentWindow->rcClient.left+45,ParentWindow->rcClient.top+30,
ParentWindow->rcClient.right-55,ParentWindow->rcClient.bottom-60,TabControl->hWnd,0,0,0);