Scrolling listbox selected item into view

In a listbox, I select one of the items programatically. It works, but that item doesn't scroll up into view.

How do I force the selected item to scroll into view?

Code:

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                int i = m_listbox.FindStringExact(-1,str);
                m_listbox.SetSel(i,TRUE);
                m_listbox.SetCaretIndex(i);

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thanks.

SetTopIndex().