/// current selection (-1 if not in selection)
//void RequestReading(tree::Node* n, int prio, int selection_index , ImagePointerHolder *p);
void RequestReading(tree::Node* n, int prio, int selection_index , boost::shared_ptr<ImagePointerHolder> p);
/// current selection (-1 if not in selection)
//void RequestReading(tree::Node* n, int prio, int selection_index , ImagePointerHolder *p);
void RequestReading(tree::Node* n, int prio, int selection_index , boost::shared_ptr<ImagePointerHolder> p);