MFC Error: Problem with CListCtrl

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MFC

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Hi everyone there,

I am developing a dialog based application in MFC and I have a CListCtrl with checkboxes. Code is as follows:

CListCtrl m_gridOutput;m_gridOutput.SetExtendedStyle(m_gridCtrlEx.GetExtendedStyle() | LVS_EX_CHECKBOXES);

I can track the changes in the ListControl but now I am trying to change the status of the Checkbox of an item. Unfortunately I am getting Assertion errors, when I try to use the following piece of code.

m_gridOutput.SetItem(1,0,LVIF_STATE,NULL,0,dwFlags,dwFlags,0);
(or)
ListView_SetItemState(m_gridOutput.GetSafeHwnd(),VarId,INDEXTOSTATEIMAGEMASK((fCheck)+ 1), LVIS_STATEIMAGEMASK);
(or)
ListView_SetCheckState((m_gridOutput.GetSafeHwnd(),Id,TRUE);

I want to add one more thing here. If I use SetCheck (or) ListView_SetCheckState in OnInitDialog(), it works fine. But if I try to use it in a seperate function, it gives assertion error. How to handle this?.

Any help is greatly appreciated.

Shiva