为何这段程序不会引起内存泄露？

下面这段程序在函数中用new操作符动态分配了一块内存，但是任何地方都没有将它删除，按道理应该出现内存泄露才是，但是对内存泄露进行检测，却发现没有出现内存泄露，这是为什么？
void CMainFrame::SwitchView(eView nView)
{
    CView* pOldActiveView = GetActiveView();
    CView* pNewActiveView = (CView *)GetDlgItem(nView);

    if(pNewActiveView == NULL){
        switch(nView){
        case STRING:
            pNewActiveView = (CView *) new CStringView;
            break;
        case HEX:
            pNewActiveView = (CView *) new CHexView;
            break;
        }

        CCreateContext context;
        context.m_pCurrentDoc = pOldActiveView->GetDocument();
        /*context.m_pCurrentFrame = this;
        context.m_pLastView = pOldActiveView;
        context.m_pNewViewClass = pOldActiveView->IsKindOf(RUNTIME_CLASS(CStringView))?RUNTIME_CLASS(CStringView):RUNTIME_CLASS(CStringView);*/
        pNewActiveView->Create(NULL,NULL,WS_BORDER,CFrameWnd::rectDefault,this,nView,&context);
        pNewActiveView->OnInitialUpdate();
    }

    SetActiveView(pNewActiveView);
    //delete pOldActiveView;
    pNewActiveView->ShowWindow(SW_SHOW);
    pOldActiveView->ShowWindow(SW_HIDE);
    pOldActiveView->SetDlgCtrlID(
        pOldActiveView->GetRuntimeClass() == RUNTIME_CLASS(CStringView)?STRING:HEX);
    pNewActiveView->SetDlgCtrlID(AFX_IDW_PANE_FIRST);

    RecalcLayout();

}