CEdit PreSubclassWindow Problem

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Hi
Do anyone know why in derived class of CEdit with PreSubclassWindow that
uses a SetWindowText while( m_hWnd is valid for both conditions)
it works fine if subclassed with DLG items but if it was created ,it
generated Diveded By Zero Access Violation.
this brief code makes scenario.
thanks in advance.

//Header
class CMyEdit : public CEdit
{
public:
CMyEdit(){}
virtual ~CMyEdit(){}
.....
protected:
virtual void PreSubclassWindow();
};
//Source
void CMyEdit::PreSubclassWindow()
{
SetWindowText("Preset Text");
}

//
class CTestDlg : public CDialog
{
...
CMyEdit m_Edmp;
...
}

BOOL CTestDlg::OnInitDialog()
{
....
m_Edmp.Create(WS_BORDER|WS_VISIBLE|WS_CHILD|ES_AUTOHSCROLL,
CRect(50,400,150,430), this, 9);
....
}




.

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