Searched the forums for this but no luck to find an answer... is there is way to check programmatically for the RoboB List ? to see if a certain page is open ... as well if there is a way to list created instances with the select action?

Not at present but you can use the robob events and a map to keep track of it by yourself.

Feel free to make a feature request but while you are at it please give more information about how you would like to use it.