MFC ListBox problem

[chesschi]

I am trying to create my own listbox class but failed. Here is the source code:

// MyListBox.h

class CMyListBox : public CListBox
{
	DECLARE_DYNAMIC(CMyListBox)

public:
	CMyListBox(void);
	virtual ~CMyListBox(void);	
	int AddDetailedString(const LPCTSTR lpszItem, const CString csDetail);
                 ...
private:
	CObArray				m_coDetails;
};

// MyListBox.cpp

IMPLEMENT_DYNAMIC(CMyListBox, CDialog)

CMyListBox::CMyListBox(void) {}

CMyListBox::~CMyListBox(void) {}

int CMyListBox::AddDetailedString(const LPCTSTR lpszItem, const CString csDetail)
{
	LPCTSTR lpszDetail = csDetail;
	m_coDetails.Add((CObject*)lpszDetail); // this line always crash
	return CListBox::AddString(lpszItem);
}

I have no idea why if I delcared a private array (or vector) variable and then push the elements to it. It always crash! If I use CObArray, I got "privileged instruction" promopt and debugger run at "AfxAssertValidObject". If I use std::vector, I got "Access Violation" and debugger run at "CheckBytes".

Please could anyone give me some suggestion to solve this problem?

Many thanks!