Sometimes after ready event of dashboard, select or other listeners can 
only be used on other controls.

Should the google.visualization.events.addListener be called only once on a 
control or is this handled internally (getKey()) ?

In other words, is the same listener is not added multiple times when 
calling google.visualization.events.addListener again?

Should the listeners always be removed (removeListener) on unload to 
prevent memory leakage?

Regards Peter

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