What I did for my application was to make a pop-up window the size of the map view I want.  I added map viewer to that pop-up window (can only have one map viewer in a product I think).  Then I added a button on top of the map viewer and made sure the order was all the way to the front for that control button.  Then I set actions for the button.

I did this for Zoom in/out map viewer buttons.  The use of the pop-up window for the map view allowed me to show/hide the map too with a main window control button.

This make sense?