[Haskell-cafe] Make two windows work together

Hi there, I am trying to make a sub-window of one window and make them work together. I mean, if I zoom or transform some content in one of the window, the other one works in the same way. What I have done so far is just open a new window which have the same drawing view as the original one, but when I try to change some content in one window, the other one does not work at the same time. They are separate. Can anyone give me some hint on how to make them work at the same time not separate anymore? Thank you so much!