How do I add InDesign's Object model to ESTK Object model viewer?

I am new to InDesign scripting, and was told that I could view InDesign's DOM in ESTK's object model viewer. The problem is that my ESTK does not show InDesign Object Model in ESTK's model selector drop down! InDesign DOM is not there in the drop down list.

How do go about adding the ID DOM to the list?

BTW, I am on CS6.