how to extend vtkImagePlaneWidget bounds

I’ve implemented MPR by using vtkImagePlaneWidget. I rotate one plane widget by changing its normal in the source code. But the bounds of the plane can not extend to the sagittal plane(the plane with red border), showed in the first picture. I want to implement the effect showed in the second picture. Can anyone give me some tips? Thanks in advance.

2020-04-25_134842