[vtkusers] (VTK4.0) How to set Control / Shift value in vtkInteractorStyle

[tirawat]

Hi ,
            I am implementing a part of event handling program. When it
received LeftButtonPress event, I pass all required parameters to
  vtkInteractorStyle::OnLeftButtonDown(). This approach worked in Vtk3
because the protected function "UpdateInternalState"  is put inside
OnLeftButtonDown() as shown below.
-----------------------------------------------------------------
void vtkInteractorStyle::OnLeftButtonDown(int ctrl, int shift, 
                                          int X, int Y) 
{
  //
 this->UpdateInternalState(ctrl, shift, X, Y);
------------------------------------------------------------------
 
However, VTK4 does not put UpdateInternalState() method inside and
OnLeftButtonDown() does not really used the function arguments. 
 
My question is  ->  
Are there any Standard ways to make vtkInteractorStyle realizes the new
Control/Shift value (WITHOUT modifying the VTK code) ?
 
Regards Tirawat
 
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