Example of CListBox function which holds scroll bar position during insertion/ removal of item

DragDropListBox.cpp

 void CDragDropListBox::SwapItem(int newIndex)
{
	DWORD data;
	CString str;
	int top;

	SetRedraw(FALSE);
	top = GetTopIndex();

	GetText(newIndex, str);
	data = GetItemData(newIndex);
	ASSERT(data != LB_ERR);
	VERIFY(DeleteString(newIndex) != LB_ERR);
	VERIFY(InsertString(m_TargetIndex, str) >= 0);
	VERIFY(SetItemData(m_TargetIndex, data) != LB_ERR);
	m_TargetIndex = newIndex;
	SetTopIndex(top);
	SetRedraw(TRUE);
 }