How to get an event for column resize invoked by user interaction (mouse left button + mouse move).

I tried SizeChanged event, but it is triggered also when new items are added to the DataGrid (with long text), but this case should not be handled.

<DataGrid.CellStyle>
    <Style TargetType="DataGridCell">
        <EventSetter Event="SizeChanged" Handler="DataGridCell_SizeChanged" />
    </Style>
</DataGrid.CellStyle>

Thanks for any advice.