Focus on Modal Dialog (MFC) - visual-c++

Question

I create modal dialog like this :
CDialog dlg;
dlg.DoModal();
but when window opens I can access background windows of my program (move them and close them) but I need focus only on my curent window. (I think modal dialog shouldn't behave like this)
How can I do this?
EDIT:
It seems I found the reason of this behavior: before open my dialog,I open another modal dialog in CMyDlg::OnInitDialog() function, when I comment this,my dialog again became modal. But how to solve this problem?
Some code describing problem:
void CMyView::OnSomeButtonPress()
{
CMyDlg dlg;
dlg.DoModal();
}
BOOL CMyDlg::OnInitDialog()
{
CDialog::OnInitDialog();
//some init here...
//new modal dialog here (if comment this CMyDlg works as modal)
CSettingsDlg dlg;
dlg.DoModal();
//...
}

Answer 1

you can solve your problem by specifying parent window for the dialog, you can do by passing this pointer in constructor of each dialog class as shown in code .
void CMyView::OnSomeButtonPress()
{
CMyDlg dlg(this);
dlg.DoModal();
}
BOOL CMyDlg::OnInitDialog()
{
CDialog::OnInitDialog();
//some init here...
CSettingsDlg dlg(this);
dlg.DoModal();
//...
}

Answer 2

You cannot use a dialog from within the OnInitDialog method or from any function called from the OnInitDialog method. You have to use the DoModal() of CSettingsDlg from else where.
Something like this:
void CMyView::OnSomeButtonPress()
{
//new modal dialog here (if comment this CMyDlg works as modal)
CSettingsDlg dlgSettings;
dlgSettings.DoModal();
...
CMyDlg dlg;
dlg.DoModal();
}
BOOL CMyDlg::OnInitDialog()
{
CDialog::OnInitDialog();
//some init here...
//...
}