In the Bing Maps v7 AJAX control, when you open an infobox it will open up where it is positioned. If you are near the edges of the map it will go beyond the edges and end up getting cut of, out of view as the infobox is within the map div which hides any overflowing elements. Here is an example.
This might not be the ideal default case, but Bing Maps is developed in such a way that it tries to give you the basic use case and all the tools needed...
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