somehow it's not possible to put the aggregated handle into custom component.
an equivalent to ProgressHandleFactory.createProgressComponent() needs to be created
Created attachment 25836 [details]
please review this small change to core/progress
a new method AggregatedProgressFactory.createProgressComponent() was added.
the change is backward compatible. diff attached.
about to integrate
Marking this issue as VERIFIED since the issue reporter == issue owner.