how to make reslice cursor axis orthogonal while moving one of them?

I’m using vtk8.0 and I made a MPR four plane use vtkResliceImageViewer and vtkResliceCursor,when I move(rotate) one of the axis,the other didn’t move.
I can’t find anyway to make them move together except press the ctrl key while moving one of them,but I want it to be default,the two axis maintaining orthogonal.
How can I do it?
Can anybody help me please