MFC 创建动态切分窗口的问题

初学者在学MFC时 尝试去写一个切分窗口的问题 采用的是动态切分 程序虽运行出来了 但是窗口无法切分

代码如下 哪位前辈来帮解决一下这个问题

#include <afxwin.h>

#include <afxext.h>

#include "resource.h"

class CMyFrame :public CFrameWnd

{

public :

	DECLARE_MESSAGE_MAP()

	DECLARE_DYNCREATE(CMyFrame)

public :

	CSplitterWnd m_wndSplitter;

public :

	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);

	virtual BOOL OnCreateClient(LPCREATESTRUCT lpCreateStruct,CCreateContext *pContext);

};

IMPLEMENT_DYNCREATE(CMyFrame,CFrameWnd)

BEGIN_MESSAGE_MAP(CMyFrame,CFrameWnd)

	ON_WM_CREATE()

END_MESSAGE_MAP()

class CMyView :public CView

{

public :

	DECLARE_DYNCREATE(CMyView)

	virtual void OnDraw(CDC *pDC);

};

IMPLEMENT_DYNCREATE(CMyView,CView)

class CMyApp : public CWinApp

{

public :

	virtual BOOL InitInstance();

};

CMyApp theApp;

BOOL CMyApp :: InitInstance()

{

	CMyFrame *pWnd =new CMyFrame();

	pWnd->LoadFrame( IDR_MAINFRM );

    m_pMainWnd = pWnd;

    m_pMainWnd->ShowWindow( SW_SHOW );

    m_pMainWnd->UpdateWindow( );

	return TRUE;

}

int CMyFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)

{

	CFrameWnd::OnCreate(lpCreateStruct);

	ModifyStyleEx( WS_EX_CLIENTEDGE, 0 );

	return TRUE;

}

void CMyView ::OnDraw(CDC *pDC)

{

	 pDC->TextOut( 50, 50, "View 1" );

}

BOOL CMyFrame::OnCreateClient(LPCREATESTRUCT lpCreateStruct,CCreateContext *pContext)

{

	 CCreateContext context;

   

    context.m_pNewViewClass = 

        RUNTIME_CLASS( CMyView );

   

    m_wndSplitter.Create( this, 2, 2,

        CSize( 50, 50), &context );

    return TRUE;

}