mfc, CListCtrl - Owner Data - Checkbox style - No checkboxes displaying.

In my OnGetDispInfo, how do I get the checkbox to show?

Currently, I only see white-space where I'd expect a checkbox (checked or
unchecked) to show up.

I'm using VS.NET 2003.

Here's my OnGetDispInfo(...)
{
NMLVDISPINFO *pDispInfo = reinterpret_cast<NMLVDISPINFO*>(pNMHDR);
LV_ITEM* pItem = &(pDispInfo)->item;

if (pItem->mask & LVIF_TEXT) //valid text buffer?
{
CString str;
CEINItem* pei = m_arrEINs.GetItem(pItem->iItem);

switch(pItem->iSubItem)
{
case CEINItem::EIN:
str.Format(_T("%ld"), pei->GetEIN());
_tcscpy(pItem->pszText, str);
break;

case CEINItem::EMPLOYER:
_tcscpy(pItem->pszText, pei->GetEmployer());
break;
}
}

if (pItem->mask & LVIF_IMAGE) //valid image?
pItem->iImage = 2; // Show checked.

*pResult = 0;
}

My OnInitDialog in main class:
mylistctrl.SetExtendedStyle(LVS_EX_FULLROWSELECT | LVS_EX_HEADERDRAGDROP
| LVS_EX_CHECKBOXES);
mylistctrl.InsertColumn(0, _T("EIN"), LVCFMT_RIGHT);
mylistctrl.InsertColumn(1, _T("Employer"), LVCFMT_LEFT);

Later, I add three items to the backing data and call
mylistctrl.SetItemCountEx(3);

I see the three items, but no checkbox images.

Any thoughts?

LVS_EX_CHECKBOXES set a state image list by default,and change the state
image of an item when the user click the checkbox or press space.
First,you need to set the callback mask of your listview control, then you
can set the check state in your LVN_GETDISPINFO handler function.


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