Checkbox cancel in unbound datagridview control

I have an unbound checkbox in a datagridview control. In the CellContentClick handler there is error checking that enables the user to cancel the event if the checkbox is checked. If the user selects Cancel I then set the value of the checkbox back to True then do a datagridview.refresh() and an Application.DoEvents thinking that should force the control to be redrawn with the checkbox checked but no such luck. Any ideas how this could be done?
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tmostadAsked:
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newyuppieCommented:
and use the CellValueChanged event rather than CellContentClick event...
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newyuppieCommented:
what happens if you use the DataGridView.Refresh() method, does it redraw?
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tmostadAuthor Commented:
No it has no effect. If I leave the form and return it is shown checked as it should be.
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newyuppieCommented:
try Form.Refresh then?
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tmostadAuthor Commented:
Nope, still no effect.
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newyuppieCommented:
cant you post part of the code?
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tmostadAuthor Commented:
Dim Response As DialogResult = MsgBox("Automatically generated values are being deleted. Are you sure you want to do this?",  MsgBoxStyle.Exclamation + MsgBoxStyle.OkCancel)

If Response = System.Windows.Forms.DialogResult.Cancel Then
    Me.DGV(e.ColumnIndex, e.RowIndex).Value = True
    Me.DGV.Refresh()
    Application.DoEvents()
    Exit Sub
End If
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newyuppieCommented:
from the MSDN documentation on CellContentClick event of the datagridview

Remarks
This event occurs when the cell content is clicked. It also occurs when the user presses and releases the SPACEBAR while a button cell or check box cell has focus, and will occur twice for these cell types if the cell content is clicked while pressing the SPACEBAR.

Use this event to detect button clicks for a DataGridViewButtonCell or link clicks for a DataGridViewLinkCell.

**IMPORTANT PART ** MY HIGHLIGHT
For clicks in a DataGridViewCheckBoxCell, this event occurs before the check box changes value, so if you do not want to calculate the expected value based on the current value, you will typically handle the DataGridView.CellValueChanged event instead. Because that event occurs only when the user-specified value is committed, which typically occurs when focus leaves the cell, you must also handle the DataGridView.CurrentCellDirtyStateChanged event. In that handler, if the current cell is a check box cell, call the DataGridView.CommitEdit method and pass in the Commit value.
**

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apparently the checkboxes change value AFTER CellContentClick consumed. try calling the DataGridView.CommitEdit in the CurrentCellDirtyStateChanged event as the article suggests.
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