itemSelected() call

I made a normal LassoComponent to select few items from a LassoSource object. I inherited SelectedItemSet in this way:

And I overwritten itemSelected() and itemDeselected() functions, just to notify to MyObject that it was selected and it must repaint. However these functions arent called when I do a multiple selection with the LassoComponent. The LassoSource::findLassoItemsInArea() and the LassoSource::getLassoSelection() are working ok. Could this be a bug? Or just the normal behavior?

Thanks you!