How to inspect map containers

While (almost) all object types can easily be inspected in terms of their elements - if the are of array-like structure - and values, I couldn't figure out how to do that with maps. Instead of a nice key - value table (what one would maybe expect) the variable editor displays just nothing! Is there an additional tweak one has to perform to get it to work or are there reasons why this can't be done in principle? If so, what are these reasons? (For example, think of a simple TESTmap = containers.Map(); TESTmap('1') = 'First value'; TESTmap('2') = 'Second value'; ) Thanks for help.