I am currently working on a web application that should implement the MVP design pattern, and I'm a little bit confused:
You could make the view where something is selected the master, containing the other two as sub views. Even so you have a master presenter und two subpresenters. If the selection in the master view changes, the master presenter tells the sub presenters to reload new data. The subviews and subpresenters do not need to know about their masters.