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I made two resizable dialogs.
One is for main, the other is for reside in the main dialog(like your ProfUIS Control sample application).
Main dialog has a group-box which is used for position and sizing of the child dialog.
When I resize main dialog, child dialog remain it’s original position and size.
Both of are derived from CExtResizableDialog and anchored at OnInitDialog().
Do I need some other work to do it?

Initially you should use the group box control to position your child dialog(s) by invoking the MoveWindow() API. Then just anchor the child dialog inside the main dialog:

CExtResizableDialog * pMainDialog = . . .
CWnd * pGroupBox = . . . // something like pMainDialog->GetDlgItem( ID_MY_GROUP_BOX )
CExtResizableDialog * pChildDialog = . . .
CRect rc;
    pGroupBox->GetWindowRect( &rc );
    pMainDialog->ScreenToClient( &rc );
    pChildDialog->MoveWindow( &rc );
    pMainDialog->AddAnchor( pChildDialog->m_hWnd, __RDA_LT, __RDA_RB );

Thanks, I omitted the last line.