IBM RTC 6.0.2 API java getting planning area information
One answer
I believe you get confused. Dojo Toolkit is a JavaScript library. All information about JavaScript extension in RTC can be found here.
https://jazz.net/wiki/bin/view/Main/AttributeCustomization
If you really mean Java API, that's a completely different thing, and you'd better go through the RTC extension workshop to get familiar with it first.