+ virtual QModelIndex findParent(const ObjectPtr& theObject) const = 0;
+
+ //! Returns index corresponded to the group
+ virtual QModelIndex findGroup(const std::string& theGroup) const = 0;
+
+ void setItemsColor(const QColor& theColor) { myItemsColor = theColor; }
+
+ QColor itemsColor() const { return myItemsColor; }