Как я могу использовать поле со списком m_my?

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how can i functional m_my combo box?

Что я уже пробовал:

void CnewprojectmengaeView::OnInitialUpdate()
{
	CView::OnInitialUpdate();

	// TODO: Add your specialized code here and/or call the base class
m_myCombo.Create(WS_CHILD | WS_VISIBLE | CBS_SIMPLE | WS_VSCROLL,
		CRect(1200, 600, 1300, 750), this, 7);
	m_myCombo.InsertString(0, _T("View"));
	m_myCombo.InsertString(1, _T("Move"));
	m_myCombo.InsertString(2, _T("Stop"));
	m_myCombo.InsertString(3, _T("Exit"));
void CnewprojectmengaeView::Onm_myCombo()
{
	// TODO: Add your implementation code here.
	if (m_myCombo.GetCurSel() == 0)
	{
		CClientDC dc(this);
		CBrush brush_black(RGB(0, 0, 0)); //Brush black the new train
		dc.FillRect(CRect(130, 171, 170, 180),
			&brush_black); //Draw train
		SetTimer(1, 30, NULL);
	}
	if (m_myCombo.GetCurSel() == 1)
	{
		CClientDC dc(this);
		CBrush brush_black(RGB(0, 0, 0)); //Brush black the new train
		CBrush brush_white(RGB(255, 255, 255)); //Brush white the old train
		dc.FillRect(CRect(X1, 171, X1 - 20, 180), &brush_black); //Draw new train
		dc.FillRect(CRect(X1 - 40, 171, X1 - 20, 180), &brush_white); //Draw the old train
		X1++; // Run the train 
		SetTimer(1, 30, NULL);
	}
	if (m_myCombo.GetCurSel() == 2)
	{
		X1--;
	}
	if (m_myCombo.GetCurSel() == 3)
	{
		exit(0);
	}
	SetTimer(1, 30, NULL);
}

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