help me please ! Problem with "OfferkeyEventL". Thanks very much !

Hi all !
In my example,I want to change DX , DY values when user press any key . I use "OfferkeyEventL" funcution for catching event but It didn't happen . Please help me ! What error I have ! Thanks very much !

------------------------------------------------- My code -----------------------------------------------------

#include "MultiviewAppUi.h"
#include "View01View.h"

void CMultiviewAppUi::ConstructL()
{
    CEikAppUi::ConstructL();
    iView01 = CView01::NewL(ApplicationRect());
    RegisterViewL(*iView01);
    AddToStackL(*iView01,iView01);
    SetDefaultViewL(*iView01);
}


#include "View01View.h"
#include "Multiview.hrh"
#include "Multiview.rsg"

CView01* CView01::NewL(const TRect& aRect)
{
    CView01* self = CView01::NewLC(aRect);
    CleanupStack::Pop(self);
    return self;
}

CView01* CView01::NewLC(const TRect& aRect)
{
    CView01* self = new( ELeave ) CView01();
    CleanupStack::PushL(self);
    self->ConstructL(aRect);
    return self;
}

CView01::CView01()
{
}

CView01::~CView01()
{
}

void CView01::ConstructL(const TRect& aRect)
{
    iRect=aRect;
    DX=100;
    DY=100;
    CreateWindowL();
    SetRect(aRect);
    ActivateL();
}

TVwsViewId CView01::ViewId() const
{
   return TVwsViewId( KUidQBasicApp,ViewUid() );
}

TUid CView01::ViewUid() const
{
     return iView01ID;
}

void CView01::Draw(const TRect& aRect) const
{
     CWindowGc& gc = SystemGc();
     TRect rect = Rect();
     gc.Clear();
     gc.SetPenColor( 0x3FEE50 );
     gc.SetBrushColor( 0x3FEE50 );
     gc.DrawRect( TRect( 10,10,DX,DY ) );
}

void CView01::ViewActivatedL(const TVwsViewId& aPrevViewId,
      TUid aCustomMessageId, const TDesC8& aCustomMessage)
{

}

void CView01::ViewDeactivated()
{
    MakeVisible(EFalse);
}

TKeyResponse CView01::OfferKeyEventL(const TKeyEvent& aKeyEvent, TEventCode aType)
{
    if(aType != EEventKey)
    {
        return EKeyWasNotConsumed;
    }
    switch(aKeyEvent.iScanCode)
    {
        //----- case user presskey next
        case 15:
        case 165:
        {
            DX=200;
            DY=200;
        } break;
    }
}

-------------------------------------------------  doctinh113114  -----------------------------------------------------------