Overview right mouse button clicks

I’m using GoXam for Silverlight and am having a problem with the Overview.

There are context menus for right button clicks over various parts in our diagram and there is a special context menu for right clicks over the Overview panel. However, when the context menu displays, the observed view also changes. I added an event handler for right mouse button up; however, whenever I can get the observed view to stay unchanged, the context menu doesn't appear either.
On a related note, I'm also interested in disabling drag of the observed view when the right mouse button is down.

That behavior is implemented by an internal Tool that is at the end of the Overview.MouseDownTools list. You can either remove that tool or disable it.