[vtkusers] How to add or remove dynamically in vtkRenderWindow?

[Lin SavageCin]

Dear All:
    I use BCB to develope vtk program. For some resons, i use vtkRenderWindow to render without using vtkBorlandRenderWindow.
   When i want to remove actor from vtkBorlandRenderWindow, the vtkBorlandRenderWindow->Invalidate will meet my needs.
   However, i can't find any function to remove actor in vtkRenderWindow.
   
  How do i solve it???
 
  Thanks~~~~ 		 	   		  
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