When adding fields by origin don't collapse data holder after adding each field

Description of problem:
Requesting minor enhancement of form modeller: When adding fields from some data holder class, the data holder 'subtree' is always collapsed after one field from it is added. This behaviour is annoying in cases when user wants to add several - but not all fields from the data holder. He has to expand the data holder after adding each field to be able to add next field. I attach a short video of to explain you my point.

Version-Release number of selected component (if applicable):
BPMS 6.0.0.CR1

Expected results:
It would be nice, if after adding a field from some expanded data holder that data holder was not collapsed automatically - instead user would decide when he wants to collapse it.