CListControl Insert Column Debug Assertion Failure - mfc

Question

In my application, I create a modal dialog that contains a mfc List Control. When I don't initialize any columns or items in the List Control, the dialog shows without error. When I try to add a column to the List Control, I get the following Debug Assertion Failed message:
If it helps, the breakpoint is at
_AFXCMN_INLINE int CListCtrl::InsertColumn(int nCol, const LVCOLUMN* pColumn)
{ ASSERT(::IsWindow(m_hWnd)); return (int) ::SendMessage(m_hWnd, LVM_INSERTCOLUMN, nCol, (LPARAM)pColumn); }
I am trying to add the column headers with the following code in OnInitDialog():
BOOL EventL::OnInitDialog()
{
m_ListEventLog.InsertColumn(0, _T("Description"), LVCFMT_LEFT, 250); //Failure happens HERE
//m_ListEventLog.InsertColumn(0, "Description", LVCFMT_LEFT, 200, 0); //I have also tried things such as this.
return FALSE;
}
I add column headers to other CListControls in my application in this way, without problems. The modal dialog is called with the code:
void ListOption::OnBnClickedEventLog()
{
EventL eventLog;
eventLog.DoModal();
}

Answer 1

Maybe you forgot to call the default function:
BOOL EventL::OnInitDialog()
{
BOOL res = CDialog::OnInitDialog();
m_ListEventLog.InsertColumn(0, _T("Description"), LVCFMT_LEFT, 250); //Failure happens HERE
//m_ListEventLog.InsertColumn(0, "Description", LVCFMT_LEFT, 200, 0); //I have also tried things such as this.
return res; // or return FALSE;
}
That's why ASSERT(::IsWindow(m_hWnd)) fails, because m_hWnd of ListView control is not ready. m_hWnd of dialog would not be ready either.

Answer 2

I had the same issue, until i added DDX_Control(pDX, IDC_LIST1, movies); to
void MainDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
DDX_Control(pDX, IDC_LIST1, movies);
}
movies - is name of the Listcontrol
CListCtrl movies;