+ /// Method returns True if the viewer can process editing objects
+ /// by mouse drugging. If this is impossible thet it has to return False.
+ virtual bool canDragByMouse() const;
+
+ /// Activate or deactivate viewer
+ /// \param toActivate - activation flag
+ void activateViewer(bool toActivate);
+
+ // Fit all along Z (perpendicular to display)
+ virtual void Zfitall();