HOWTO: Set tooltip in row number item?

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   Hello;

I use the integrated row numbering feature, but I need a tooltip to be shown when the mouse is over this item.
How can I achieve this?

To enable row numbering I use this code sequence:

  ReportCtrl_.AssignIconViewPropNumAndIconNum(-1, -1, TRUE, 30);
  ReportCtrl_.GetPaintManager()->m_iRecOrRowStart=1;

therefore I expect item (column) -1 to contain the row number, but I always get NULL pointers when calling GetItem(-1). What do I have to call to get the corresponding item for the row number - especially while creating a new record?

TIA