Shock: Switched from UnstructuredGrid to MultiblockDataset, fields disappeared

Hello dear VTK developers!

Could you please explain me the following:

  1. before today, I was using vtkDataSetAlgorithm with UnstructuredGrid. And after the empty stage the empty data objects seemed to have contained fields, which I used in custom widgets

  2. today I used MultiblockDataset, however, it seems there is a problem: it does not contain any leaves with Data Objects, since it’s empty. So I cant get an access to the fields of the blocks from my custom widgets

Help me please and thanks You a lot!