- vtkInteractorStyleBaseView *isbv = (vtkInteractorStyleBaseView*)(_wxvtkbaseview->GetInteractorStyleBaseView());
- isbv->AddInteractorStyleMaracas( new vtkInteractorManualPaint(this) );
+ if (_wxvtk2Dbaseview!=NULL)
+ {
+ vtkInteractorStyleBaseView *isbv = (vtkInteractorStyleBaseView*)(_wxvtk2Dbaseview->GetInteractorStyleBaseView());
+ isbv->AddInteractorStyleMaracas( new vtkInteractorManualPaint(this) );
+ }