When expand object, one can configure member name to expand
When expand object, one can configure member name to expand

For instacne, for TCanvas and TPad such member is fPrimitives.
In the browser one will see only list of primitives. 
All members can be seen via inspector
bellenot/jsroot,linev/jsroot,root-project/jsroot,root-project/jsroot,bellenot/jsroot,linev/jsroot,bellenot/jsroot