how to make the same window width/level at MPR

I can get MPR views use vtkImagePlaneWidget vtkResliceCursorWidget and so on. I can through SetInteractorStyle function to set mouse event. when I change one of the views’s window width/level with drag mouse, I wish the other two views change w/l at the same time. But I can’t capture the change w/l message and add my code. how can I achieve my idea?

WindowLevelEvent, I find it