BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext)
{
    // SIZE OF CLIENT AREA
    CRect clientRect;
    GetClientRect(&clientRect);    
    int Col1Width = clientRect.Width()/4;
    int Col2Width = clientRect.Width() - Col1Width;
    /*===========================================
    SPLIT CLIENT AREA INTO 2 SEPARATE COLUMNS
    ============================================*/
    VERIFY (
        m_wndSpltForCols.CreateStatic (
            this, 
            1,        // NUMBER OF ROWS
            2        // NUMBER OF COLUMNS
        )
    );
    /*=======================================
        VIEW FOR 2ND COLUMN 
    ========================================*/
    VERIFY (    
        m_wndSpltForCols.CreateView (0,    // ROW POSITION
        1,                // COLUMN POSITION            
        RUNTIME_CLASS(CSplitFrame),    // VIEW CLASS FOR PANE
        CSize(Col2Width, clientRect.Height()),    // SIZE OF PANE 
        pContext                //
        )
    );
    /*=======================================
    SPLITTING 1ST COLUMNS INTO 2 COLUMNS
    ========================================*/
    VERIFY (
        m_wndSpltForRows.CreateStatic (
            &m_wndSpltForCols,            // PARENT OBJECT 
            2,                    // NUMBER OF ROWS
            1,                    // NUMBER OF COLUMNS
            WS_CHILD|WS_VISIBLE,            // STYLES
            m_wndSpltForCols.IdFromRowCol(0,0)    // WHICH COLUMN IS TO BE SPLITTED
        )
    );
    /*=======================================
    VIEW FOR FIRST ROW - CONTAINS CTreeCtrl 
    ========================================*/
    VERIFY     (
        m_wndSpltForRows.CreateView (
            0,
            0,             
            RUNTIME_CLASS(CNavOptionsView),
            CSize(10,10), 
            pContext
        )
    );
    /*=============================================
    VIEW FOR SECOND ROW - MAIN NAVIGATION BUTTONS
    ===============================================*/
    VERIFY (
        m_wndSpltForRows.CreateView (
            1,
            0,             
            RUNTIME_CLASS(CNavigateView),
            CSize(10,10), 
            pContext
        )
    );        
    m_wndSpltForCols.RecalcLayout();
    //SPLITTER WINDOW INITIALIZATION FLAG
    m_isWndSpltsInitialize = true;
    return true;    
}
 
 
The actual problem that i face in below function....By logic i think it fails but below function works 100% when i run application in Debug mode but when i run it in Release mode...application popups an Unhandle Exception.
 
 
bool CSagsDoc::SwitchToView(CView* pOldViewClass, CRuntimeClass* pNewViewClass)
{    
 
    if (pOldViewClass->IsKindOf(pNewViewClass)) return TRUE;
 
    CFrameWnd* pMainWnd = (CFrameWnd*)AfxGetMainWnd();    
 
    CEnhSplitterWnd* pSplitter = (CEnhSplitterWnd *)pOldViewClass->GetParent();
 
    int row = 0, col= 0;
    ASSERT(pSplitter->IsChildPane(pOldViewClass, &row, &col));
 
    CRect viewrect;
    pOldViewClass->GetWindowRect(&viewrect);
 
    // DELETEING PANE VIEW
    m_bAutoDelete = FALSE;                
    pOldViewClass->DestroyWindow();        
    m_bAutoDelete = TRUE;                
 
 
    CCreateContext context;
    context.m_pNewViewClass        = pNewViewClass;
    context.m_pCurrentDoc        = this;
 
    if (!pSplitter->CreateView(row, col, pNewViewClass, viewrect.Size(),&context))
        return false;    
 
    // Set active
    CView* pNewView = (CView *)pSplitter->GetPane(row, col);
    if (pNewView)
    {
        pNewView->GetParentFrame()->RecalcLayout();
    }
 
    // EXCEPTION In Release Version
    if (pSplitter)
    {
        pSplitter->GetParentFrame()->SetActiveView(pNewView);    /** EXCEPTION OCCUR HERE **/        
        pSplitter->SetActivePane(row, col);
        pSplitter->RecalcLayout();        
 
    }    
 
    pNewView->OnInitialUpdate();
    pNewView->SendMessage(WM_PAINT);
    pNewView->SendMessage(WM_SIZE);    
    return true;
}